The VN Zemplínska Šírava water body and its fishing districts at a glance
VN Zemplínska Šírava is divided into 2 fishing districts.Together they measure 20.7 km.1 are carp waters and 1 salmonid trout waters.All lie in Michalovce district (Košice Region).They are looked after by 2 SRZ organizations.The longest is fishing district VN Zemplínska Šírava – prítoky (13.3 km).It belongs to the Bodrog and Hornád river basin.
Is it worth going today? Fishing conditions score, the best window of the day and fishing districts from the best conditionsConditions score61 / 100Best window14:00
Average of the water body's fishing districts
61from 100
High activity · average of 2 fishing districts
The number in the header is an estimate for the middle of the water body based on weather and measurements. The average of the fishing districts also counts satellite data, shading and geology of each district.
Very high0
High1
Average1
Low0
Best window today
14:00–16:00
VN Zemplínska Šírava – prítoky, window score 83.
The score is an estimate of conditions based on weather, water and surroundings, not a bite forecast. Recalculated at 10:26.
Map and fishing districts of the VN Zemplínska Šírava water body
The water body and its fishing districts. You can switch the map color to today's conditions, quality or any other parameter.Fishing districts2Length20,7 km
Detailed filtersregion, district, riverbed, depth, shading, satellites, water chemistry and pollution, fish, geology
1445fishing districts
Pick a category to narrow the selection. Next to each option you can see how many fishing districts remain.
Map color
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Move the map with two fingers. In full-screen mode one finger is enough.
CarpSalmonid (trout)Salmonid (grayling)
lowerhigher
The score is an estimate of conditions based on weather, water and surroundings, not a bite forecast. For each fishing district you can see what it is made of, how well it is supported by data and where the data comes from.
About VN Zemplínska Šírava
Area, depth and origin of the water body and what it looks likeArea3 300 haYear established1968
Source: SHMÚ (yearbooks on surface and groundwater quality), the register of wastewater treatment plants from VÚVH and the EEA. A SHMÚ site is assigned to a fishing district by the same watercourse name and by distance; the yearbook lists the sites that failed the standard, so a missing site is not proof of clean water.
Terrain and satellite images of the VN Zemplínska Šírava water body
Elevation profile, 3D terrain of the surroundings and historical satellite imagesHighest point708 m n. m.Lowest point118 m n. m.
Elevation profile: reservoir
Terrain height along the fishing district and the approximate water level.
ReservoirThis is a reservoir, so the watercourse is not assessed here: the water has no current, fall or gradient. The chart shows the terrain height along the fishing district.
Terrain elevation profile (Reservoir): from 708 to 118 m a.s.l. over 8.4 km.Terrain height along the fishing district line, from the start (left) to the end
Approximate water level
178 m a.s.l.
Lowest point of the profile
118 m a.s.l.
Highest point of the profile
708 m a.s.l.
Source: Open Topo Data (eudem25m), 4 Nov 2026. The height is approximate (error of a few metres).
Terrain in 3D
Loading the 3D terrain model…
Historical images
Changes in the surroundings and nature from 2019 to 2025: how the banks, vegetation and landscape around the water change. The images switch automatically; you can also browse them by hand.
2019imaged 4 Jul 20192022imaged 10 Oct 20222025imaged 24 Jul 2025
Geology and geochemistry of the VN Zemplínska Šírava water body
Geology at a glance and a map of the zone
What lies beneath the water and around it? An overview in tiles, a map of mine workings, deposits, environmental burdens, boreholes and gold finds, and how to read the data
The overview is based on public registers and atlases of the State Geological Institute of Dionýz Štúr. The search covers a zone around the water of all fishing districts of the stream (21 km of line in total): stream samples within 1 km, boreholes, mine workings and burdens within 3 km, ore occurrences within 5 km, geothermal sources within 10 km.
Rock under the water
River alluvium60% of the water line
20% other rocks, 10% volcanic rocks
Gravelly and sandy bottom and floodplains; the water is replenished from groundwater in the alluvium. Geological Map of Slovakia 1:50,000.
Water according to the atlas
pH 7.5modelled estimate
water type Ca–HCO₃
Mineralisation 200 mg/l, soft water (6.1 °dH). Interpolation of measurements from the Geochemical Atlas of Slovakia, not a measurement in the stream.
Elements in river sediment
0 from 15elements in the top 10 %
highest: Cobalt 11.1 mg/kg
Position of the highest-ranked element among the sample points on streams in Slovakia: percentile 81. Interpolation of the Geochemical Atlas of river sediments.
up to 50 %
50–75
75–90
90–99
above 99
Heat underfoot
52°C at 1,000 m depth
heat flow 105 mW/m²
At a depth of 2,000 m about 95 °C (increase of 43 °C per kilometre). Atlas of Geothermal Energy of Slovakia.
Natural gamma radiation
47nGy/h dose rate
percentile 26 in Slovakia
Natural background from rocks and soil (potassium, uranium, thorium), not a value measured at the water. Airborne gamma-ray spectrometry by ŠGÚDŠ.
Old mine workings
1object within 3 km
Nearest: Šachta (shaft), 1.7 km from the water.
Gold in river sediment
1sample with gold
12 ore minerals in the sediment
Up to 3 grains in one sample (90 m from the water). Panning prospecting counted gold grains in a concentrate from river sediment.
up to 50 %
50–75
75–90
90–99
above 99
Trace elements in the stream water
1 from 9indicators in the top 5 %
highest: Cadmium 1.20 μg/l
Position of the highest measured value in the distribution of all surface water samples in Slovakia: percentile 96 (Kamenný, potok).
up to 50 %
50–75
75–90
90–99
above 99
Boreholes and groundwater analyses
762boreholes within 3 km
893 water analyses nearby
Of these, 658 have an archive report from Geofond. The boreholes are hydrogeological, geological, engineering-geological and other.
Geothermal energy
39°C at the wellhead
2 geothermal boreholes within 10 km
Warmest: Kaluža – GTH-1, 2.8 km from the water.
Environmental burdens and landfills
11sites within 3 km
2 environmental burdens, 9 landfills
Nearest burden: Michalovce – mestské kasárne – autopark, 160 m from the water. Proximity does not mean that substances leak from the site into the water.
Deposits and ore occurrences
33records within 5 km
15 deposits, 18 ore occurrences
Geofond registers, the metallogenetic map and the mineral resources map.
Landslides and slope deformations
34areas within 3 km
1 active
Documented landslides in the Geofond register. A landslide into a stream can cloud the water and change the bed.
Map of the corridor
Where the nearest mine workings, deposits, burdens, geothermal boreholes and gold finds are. Groups can be switched off.
The line is the water of the fishing district, the light band is the 3 km zone in which boreholes, mine workings and burdens were searched for. The map shows the nearest objects (at most a few dozen from each register), not all of them. The points correspond to the position in the register; area objects are marked by their centre.
How to read these data
Zone and distance. The distance is measured from the line of the water to the point in the register (to the centre for areas), with an accuracy of tens of metres. Counts apply only to the zone, not to the whole catchment.
Percentile. For chemistry, the highest value is compared with all atlas samples in Slovakia. It is not a legal limit or a health risk assessment; the atlases are historical (published: surface waters 2015, groundwater 1996, river sediments 1999).
Limit of quantification. Many samples have a value at the lowest level the laboratory can determine; such results mean "below the limit". For these, the position in the distribution is an estimate.
Panning concentrates. Only samples with a find are recorded. The number of grains in a concentrate is not the gold content in grams per tonne.
Relation to water. A mine working, landfill or burden nearby proves nothing about the quality of the water in the stream. It serves as a prompt for attention and a starting point for further investigation.
Sample points. The area and raster maps of ŠGÚDŠ cannot be downloaded as points, so along the line of each fishing district the value is looked up at points roughly every 3 km. It is a sample of the line, not a continuous record; a very short section may have a single point.
Atlas rasters. The chemistry of water and sediments is an interpolation of measurements in a sampling network (Geochemical Atlas of Slovakia). The value at a point is a modelled estimate for the surroundings, not a measurement in the water. The percentile compares the average of this stream with all sample points on streams in Slovakia.
Positions and scales. The maps have different scales (1:50,000 to 1:1,000,000), so the level of detail differs between sections. A map outside its coverage means there is no area at that point, not that there is nothing there.
What does the water flow over? Geological structure and age of the rocks, groundwater aquifers, relief, climate, soils and geophysical fields
Geological structure beneath the water
Which rock lies beneath the water line (Geological Map of Slovakia 1:50,000), how old it is, how thick the Quaternary cover is and in which tectonic unit the water flows. The bedrock decides the hardness of the water, the bottom, the turbidity after rain and the abundance of springs.
The points follow the water line (for a stream and a basin, fishing district after fishing district). The strip is a cross-section by distance, not a map; the width of a section corresponds to the number of points.
River alluvium60%SR 72 %
Other rocks20%SR 4.1 %
Volcanic rocks10%SR 3.2 %
Young sediments10%SR 8.6 %
marker on the bar: share among all sample points on streams in Slovakia
River alluvium: Gravelly and sandy bottom and floodplains; the water is replenished from groundwater in the alluvium.
Geological age of the rocks
Quaternary70%
water20%
neovolcanic rocks10%
Most common rock units
System
Age
Unit
Points
Quaternary
Holocene
fluvial sediments: lithofacial undivided alluvial clays, or sandy to gravelly clays of valleys and floodplains
3×
Quaternary
Holocene
fluvial sediments: resedimented alluvial sandy gravels of the near-channel zone
proluvial sediments: loamy and sandy gravels with rock fragments to residues in lower middle drift k
1×
Quaternary
Pleistocene – Holocene
deluvial-Fluvial-Solifluch Sediments: clay, sandy loam, gravel-stone clay, boulders to blocks
1×
Quaternary cover
fluvial sediments of floodplains50%SR 68 %
proluvial sediments of terraced alluvial cones33%SR 2.5 %
fluvial sediments17%SR 2.3 %
marker on the bar: share among all sample points on streams in Slovakia
Typical thickness of the Quaternary cover7.8m
5 – 1050%SR 20 %
2 – 533%SR 48 %
15 – 2017%SR 1.7 %
marker on the bar: share among all sample points on streams in Slovakia
Tectonic division
NEOALPÍNSKE TEKTONICKÉ ŠTRUKTÚRY ZÁPADNÝCH KARPÁT100%SR 84 %
marker on the bar: share among all sample points on streams in Slovakia
Neotectonic units
positive unit (lowland hills)100%SR 14 %
marker on the bar: share among all sample points on streams in Slovakia
Direction of neotectonic movements
small uplift50%SR 7.7 %
very small uplift50%SR 6.4 %
marker on the bar: share among all sample points on streams in Slovakia
Regional geological division
intramontane basins55%SR 44 %
neovolcanic rocks45%SR 10 %
marker on the bar: share among all sample points on streams in Slovakia
Regional geological division (subunits)
East Slovak Basin55%SR 7.6 %
neovolcanic rocks of Vihorlatské vrchy45%SR 0.0 %
marker on the bar: share among all sample points on streams in Slovakia
Engineering-geological districts
region of lowland-stream deposits29%SR 20 %
water body29%SR 4.8 %
region of alluvial-plain deposits14%SR 15 %
region of effusive rocks14%SR 3.1 %
region of proluvial cones and mantles14%SR 2.7 %
marker on the bar: share among all sample points on streams in Slovakia
Engineering-geological formations
formation of Quaternary sediments80%SR 71 %
neovolcanic formation20%SR 4.5 %
marker on the bar: share among all sample points on streams in Slovakia
Susceptibility of the area to slope deformations
Region of stable areas89%SR 95 %
Region of potentially unstable areas11%SR 4.4 %
marker on the bar: share among all sample points on streams in Slovakia
The map covers 10 of 11 points on the water line.
Hydrogeology: aquifers and groundwater
Streams and rivers are fed by groundwater. Hydrogeological maps show in which rocks the water is stored, how permeable they are and what the water in them is like. The data come from ŠGÚDŠ maps, not from measurements at a particular water.
Aquifer rocks (hydrogeological map 1:200,000)
Basic volcanic rocks50%SR 6.6 %
Gravel17%SR 52 %
Sand17%SR 3.9 %
Acid volcanic rocks17%SR 3.2 %
marker on the bar: share among all sample points on streams in Slovakia
Aquifer type
Menšie zvodnence s medzizrnovým alebo puklinovým typom priepustnosti alebo oblasti s takmer žiadnymi množstvami podzemnej vody38%SR 6.4 %
;;25%SR 0.5 %
Zvodnence s prevažne medzizrnovým typom priepustnosti (prevažne nespevnené sedimenty) (Gravel; Fluviálne)13%SR 27 %
Menšie zvodnence s medzizrnovým alebo puklinovým typom priepustnosti alebo oblasti s takmer žiadnymi množstvami podzemnej vody (Sand)13%SR 2.4 %
Menšie zvodnence s medzizrnovým alebo puklinovým typom priepustnosti alebo oblasti s takmer žiadnymi množstvami podzemnej vody13%SR 3.2 %
marker on the bar: share among all sample points on streams in Slovakia
Type of permeability (basic hydrogeological map 1:50,000)
fissure50%SR 12 %
intergranular50%SR 86 %
marker on the bar: share among all sample points on streams in Slovakia
Hydrogeological function
aquifer100%SR 95 %
marker on the bar: share among all sample points on streams in Slovakia
Main hydrogeological region
Neogene of the East Slovak Plain between Laborec and Čierna Voda57%SR 0.0 %
neovolcanic rocks of Vihorlatské vrchy29%SR 0.0 %
Quaternary of the Laborec from Strážske to Stretava14%SR 0.0 %
marker on the bar: share among all sample points on streams in Slovakia
Genetic type of groundwater
silicate-carbonate-potamogenic50%SR 1.4 %
silicate50%SR 2.9 %
marker on the bar: share among all sample points on streams in Slovakia
Chemical type of groundwater
Ca-(+/-Mg)-HCO350%SR 1.1 %
Ca-(+/-Mg)-HCO3-(+/-SO4)25%SR 0.0 %
Ca-Mg-HCO325%SR 26 %
marker on the bar: share among all sample points on streams in Slovakia
Groundwater quality class
B100%SR 18 %
marker on the bar: share among all sample points on streams in Slovakia
Geothermal groundwater bodies
Humenné Ridge100%SR 4.4 %
marker on the bar: share among all sample points on streams in Slovakia
Relief, climate and soils
A basin is not just water: slope and elevation determine the speed of runoff, climate the temperature and amount of water, and soils what is washed into the stream. The data come from the geomorphological division, climatic-geographical types and soil maps of ŠGÚDŠ.
Elevation of geomorphological units (from–to)95–866m a.s.l.
Average elevation of the units258m a.s.l.
Average slope5.2°
Average January temperature-3.0°C
Average July temperature18.8°C
Annual precipitation684mm
Geomorphological units
East Slovak Hills56%SR 1.1 %
Vihorlat Mountains33%SR 0.0 %
East Slovak Plain11%SR 3.8 %
marker on the bar: share among all sample points on streams in Slovakia
Geomorphological regions
East Slovak Lowland67%SR 4.9 %
Vihorlat–Gutin area33%SR 0.5 %
marker on the bar: share among all sample points on streams in Slovakia
Climatic-geographical types
lowland climate88%SR 38 %
mountain climate13%SR 33 %
marker on the bar: share among all sample points on streams in Slovakia
Susceptibility of soils to acidification
soils moderately susceptible to acidification67%SR 25 %
soils susceptible to acidification33%SR 31 %
marker on the bar: share among all sample points on streams in Slovakia
Soil contamination (map 1:500,000)
relatively clean soil91%SR 53 %
uncontaminated soil, the geogenically determined content of some risk elements reaches limit values A9.1%SR 45 %
marker on the bar: share among all sample points on streams in Slovakia
Lithogeochemical types
Neogene volcanics78%SR 11 %
Neogene22%SR 48 %
marker on the bar: share among all sample points on streams in Slovakia
Geophysical fields: magnetics and gravity
Maps of the magnetic field and gravity (ŠGÚDŠ) reveal what lies beneath the sediments and the surface: volcanic bodies, faults and crustal thickness. For an angler they are interesting indirectly: they show where the bedrock changes, and with it the water.
Magnetic anomaly
+40nT
range -68 to 312 nT
Deviation of the Earth's magnetic field from its surroundings. Positive and negative anomalies reveal rocks with magnetite (basalts, basic volcanic rocks) and boundaries in the bedrock.
negativepositive
Bouguer gravity anomaly
+2mGal
residual +12.8 mGal
Negative values lie over thick sediments and under mountains (light crust), positive over dense rocks and thinner crust. It shows the structure of the Earth's crust, not the water.
Chemistry of water and river sediments
What is in the water and on the bed? Trace elements and metals, nutrients, major ions, elements in sediments and groundwater
Surface water chemistry according to the atlas
Modelled composition of the water in the area the fishing district line runs through. The rasters of the Geochemical Atlas of Slovakia (surface waters) are an interpolation of measurements in sampled streams, so they show the typical background of the area, not a measurement in a particular stream.
Water acidity
pH 7.55typical range
Most rivers and streams in Slovakia have a pH of 6.5 to 8.5. More acidic water is found in streams on acidic rocks (granites, quartzites), more alkaline water near limestones.
Water hardness
6.1°dH, soft
Sum of calcium and magnesium (1.08 mmol/l). Hard water is buffered and its pH changes more slowly; soft water is more sensitive to acid rain.
soft
medium
hard
very hard
Dissolved substances
200mg/l mineralisation
Total amount of dissolved minerals. Clean mountain water has tens of mg/l, lowland and limestone waters hundreds.
up to 50 %
50–75
75–90
90–99
above 99
Ionic composition of the water
Cations (positive ions)
Ca 63Mg 21Na+K 16
Anions (negative ions)
HCO₃ 71SO₄ 22
Water type by dominant ions: Ca–HCO₃
Shares are in equivalents, the usual way of comparing the composition of waters.
Major ions
FluoridesF0.153 mg/lpercentile 67
PotassiumK2.88 mg/lpercentile 48
SodiumNa7.81 mg/lpercentile 44
ChloridesCl6.45 mg/lpercentile 42
SulphatesSO426.7 mg/lpercentile 29
CalciumCa32.4 mg/lpercentile 21
BicarbonatesHCO3110 mg/lpercentile 21
MagnesiumMg6.65 mg/lpercentile 18
dot: average along the water line, line: from the lowest to the highest value, scale: position among sample points on streams in Slovakia (0 to 100th percentile)
Nutrients and organic pollution
AmmoniumNH40.168 mg/lpercentile 64
PhosphatesPO40.198 mg/lpercentile 59
Chemical oxygen demandChSK2.98 mg/lpercentile 45
NitratesNO35.00 mg/lpercentile 38
Metals
AluminiumAl308 μg/lpercentile 88
ManganeseMn174 μg/lpercentile 88
IronFe0.252 mg/lpercentile 80
ZincZn13.0 μg/lpercentile 74
Trace elements in surface waters
Arsenic, antimony, cadmium, lead, copper, zinc and other elements in samples from rivers and streams (Geochemical Atlas of Slovakia, surface waters, 2015). The bar shows where the highest value lies among all samples in Slovakia; the light marker is the median of the samples at this water.
CadmiumCdhigh (top 5 %)
highest 1.20 μg/lmedian 0.150 μg/l13 samples69 % below the limit of quantification
up to 50 %
50–75
75–90
90–99
above 99
Highest value: Kamenný, potok, 100 m from the water. Comparison: percentile 96 of all samples in Slovakia.
SeleniumSeelevated (top 10 %)
highest 0.570 μg/lmedian 0.500 μg/l13 samples92 % below the limit of quantification
up to 50 %
50–75
75–90
90–99
above 99
Highest value: Jovsiansky, potok1998, 770 m from the water. Comparison: percentile 92 of all samples in Slovakia.
CopperCuslightly elevated
highest 4.30 μg/lmedian 2.60 μg/l14 samples14 % below the limit of quantification
up to 50 %
50–75
75–90
90–99
above 99
Highest value: Kamenný, jarok1998, 70 m from the water. Comparison: percentile 89 of all samples in Slovakia.
ArsenicAsslightly elevated
highest 3.38 μg/lmedian 0.880 μg/l13 samples31 % below the limit of quantification
up to 50 %
50–75
75–90
90–99
above 99
Highest value: Viniansky, potok1998, 770 m from the water. Comparison: percentile 86 of all samples in Slovakia.
AntimonySbslightly elevated
highest 0.940 μg/lmedian 0.500 μg/l13 samples85 % below the limit of quantification
up to 50 %
50–75
75–90
90–99
above 99
Highest value: Jovsiansky, potok1998, 770 m from the water. Comparison: percentile 81 of all samples in Slovakia.
ChromiumCrslightly elevated
highest 2.80 μg/lmedian 2.15 μg/l14 samples7 % below the limit of quantification
up to 50 %
50–75
75–90
90–99
above 99
Highest value: Viniansky, potok1998, 690 m from the water. Comparison: percentile 80 of all samples in Slovakia.
StrontiumSrslightly elevated
highest 347 μg/lmedian 199 μg/l13 samples
up to 50 %
50–75
75–90
90–99
above 99
Highest value: Laborec2000, 170 m from the water. Comparison: percentile 77 of all samples in Slovakia.
LeadPbbelow half of Slovakia
highest 2.50 μg/lmedian 2.50 μg/l12 samples100 % below the limit of quantification
up to 50 %
50–75
75–90
90–99
above 99
Highest value: Laborec2000, 200 m from the water. Comparison: percentile 43 of all samples in Slovakia.
LithiumLibelow half of Slovakia
highest 5.00 μg/lmedian 5.00 μg/l13 samples100 % below the limit of quantification
up to 50 %
50–75
75–90
90–99
above 99
Highest value: Laborec2000, 200 m from the water. Comparison: percentile 34 of all samples in Slovakia.
Major ions, mineralisation and pH
Basic water chemistry: which rocks the minerals in it come from.
Silicon dioxideSiO2high (top 5 %)
highest 40.6 mg/lmedian 31.5 mg/l6 samples
up to 50 %
50–75
75–90
90–99
above 99
Highest value: Kamenný, jarok1998, 70 m from the water. Comparison: percentile 95 of all samples in Slovakia.
Elements in river sediments
The Geochemical Atlas of Slovakia (river sediments) describes what the river carries in the fine material on its bed. Sediment collects metals from rocks, ore occurrences and past mining and industry. It is not a legal limit or a health risk assessment: it shows how an element on this stream ranks among streams in Slovakia.
Potentially toxic and trace elements
CobaltCo11.1 mg/kgpercentile 81
VanadiumV81.2 mg/kgpercentile 74
ChromiumCr86.6 mg/kgpercentile 70
CadmiumCd0.246 mg/kgpercentile 63
AntimonySb0.813 mg/kgpercentile 63
MolybdenumMo0.420 mg/kgpercentile 58
LeadPb16.7 mg/kgpercentile 56
TinSn2.71 mg/kgpercentile 52
BismuthBi0.219 mg/kgpercentile 51
SeleniumSe0.242 mg/kgpercentile 49
ZincZn91.6 mg/kgpercentile 45
NickelNi19.2 mg/kgpercentile 26
CopperCu18.0 mg/kgpercentile 24
MercuryHg0.0593 mg/kgpercentile 20
ArsenicAs4.60 mg/kgpercentile 20
dot: average along the water line, line: from the lowest to the highest value, scale: position among sample points on streams in Slovakia (0 to 100th percentile)
Major elements (iron, aluminium, calcium, magnesium, potassium, sodium, titanium, manganese, phosphorus)
TitaniumTi6,530 mg/kgpercentile 90
IronFe3.47 %percentile 81
ManganeseMn1,164 mg/kgpercentile 76
AluminiumAl6.23 %percentile 69
MagnesiumMg0.936 %percentile 55
SodiumNa0.824 %percentile 41
CalciumCa1.40 %percentile 29
PotassiumK1.34 %percentile 24
PhosphorusP592 mg/kgpercentile 17
Further elements (barium, strontium, lithium, rubidium, zirconium, yttrium, cerium, boron, beryllium, gallium)
BerylliumBe1.75 mg/kgpercentile 70
GalliumGa15.8 mg/kgpercentile 66
ZirconiumZr449 mg/kgpercentile 65
YttriumY30.3 mg/kgpercentile 64
LithiumLi28.2 mg/kgpercentile 43
RubidiumRb80.3 mg/kgpercentile 29
CeriumCe52.2 mg/kgpercentile 25
StrontiumSr109 mg/kgpercentile 24
BariumBa366 mg/kgpercentile 23
BoronB47.6 mg/kgpercentile 19
Groundwater: chemistry and water types
Hydrogeochemical objects (analyses of springs and boreholes) and the geochemical atlas of groundwater (1996). Groundwater feeds streams, so its composition also affects the water in the stream.
Chemical water types nearby
Ca-HCO328×
Ca-Mg-HCO324×
Ca-HCO3-SO46×
Ca-Mg-HCO3-SO45×
Ca-Mg-HCO3-NO32×
K-HCO31×
Ca-SO4-HCO31×
Ca-Na-HCO31×
Water quality class according to the hydrogeochemical map
class B51×
class D8×
class H5×
class C4×
class F3×
class E1×
class A1×
Metals in groundwater
SeleniumSeextreme (top 1 %)
highest 7.50 μg/lmedian 0.500 μg/l66 samples73 % below the limit of quantification
up to 50 %
50–75
75–90
90–99
above 99
Highest value: studňa1993, 770 m from the water. Comparison: percentile 99 of all samples in Slovakia.
ZincZnextreme (top 1 %)
highest 11,675 μg/lmedian 90.5 μg/l66 samples
up to 50 %
50–75
75–90
90–99
above 99
Highest value: studňa1993, 1.6 km from the water. Comparison: percentile 99 of all samples in Slovakia.
AluminiumAlextreme (top 1 %)
highest 0.900 mg/lmedian 0.0100 mg/l66 samples36 % below the limit of quantification
up to 50 %
50–75
75–90
90–99
above 99
Highest value: studňa1993, 2.3 km from the water. Comparison: percentile 99 of all samples in Slovakia.
LeadPbextreme (top 1 %)
highest 9.00 μg/lmedian 1.00 μg/l66 samples47 % below the limit of quantification
up to 50 %
50–75
75–90
90–99
above 99
Highest value: studňa1993, 1.6 km from the water. Comparison: percentile 99 of all samples in Slovakia.
MercuryHgextreme (top 1 %)
highest 1.10 μg/lmedian 0.100 μg/l66 samples94 % below the limit of quantification
up to 50 %
50–75
75–90
90–99
above 99
Highest value: studňa1993, 740 m from the water. Comparison: percentile 99 of all samples in Slovakia.
CadmiumCdhigh (top 5 %)
highest 1.20 μg/lmedian 0.250 μg/l66 samples76 % below the limit of quantification
up to 50 %
50–75
75–90
90–99
above 99
Highest value: studňa1993, 100 m from the water. Comparison: percentile 97 of all samples in Slovakia.
CopperCuhigh (top 5 %)
highest 9.30 μg/lmedian 1.35 μg/l66 samples
up to 50 %
50–75
75–90
90–99
above 99
Highest value: vrt1993, 3.0 km from the water. Comparison: percentile 97 of all samples in Slovakia.
ArsenicAshigh (top 5 %)
highest 7.90 μg/lmedian 0.500 μg/l66 samples70 % below the limit of quantification
up to 50 %
50–75
75–90
90–99
above 99
Highest value: studňa1993, 740 m from the water. Comparison: percentile 96 of all samples in Slovakia.
LithiumLihigh (top 5 %)
highest 69.0 μg/lmedian 4.00 μg/l66 samples23 % below the limit of quantification
up to 50 %
50–75
75–90
90–99
above 99
Highest value: studňa1993, 1.6 km from the water. Comparison: percentile 96 of all samples in Slovakia.
ChromiumCrelevated (top 10 %)
highest 2.90 μg/lmedian 0.250 μg/l66 samples56 % below the limit of quantification
up to 50 %
50–75
75–90
90–99
above 99
Highest value: vrt1993, 2.3 km from the water. Comparison: percentile 93 of all samples in Slovakia.
AntimonySbelevated (top 10 %)
highest 0.400 μg/lmedian 0.100 μg/l66 samples98 % below the limit of quantification
up to 50 %
50–75
75–90
90–99
above 99
Highest value: studňa1993, 1.8 km from the water. Comparison: percentile 90 of all samples in Slovakia.
IronFetypical value
highest 0.00500 mg/lmedian 0.00500 mg/l29 samples100 % below the limit of quantification
up to 50 %
50–75
75–90
90–99
above 99
Highest value: studňa1993, 1.8 km from the water. Comparison: percentile 50 of all samples in Slovakia.
Gold, mines and deposits
Was gold panned and ore mined here? Gold and ore minerals in river sediments, old mine workings, deposits and ore occurrencesSamples with gold1Mine workings1
Gold and ore minerals in river sediments
Regional panning prospecting: the heavy fraction was washed out of river gravel and the mineral grains in it were counted. The map of finds is positive: a sample without gold is not listed in the atlas, so the absence of a find is not proof that there is no gold.
Ilmenit (FeTiO₃)19 samples, at most 4115 grains
Magnetite (Fe₃O₄)19 samples, at most 315 grains
Limonite (FeO(OH)·nH₂O)18 samples, at most 55 grains
Rutil (TiO₂)18 samples, at most 315 grains
Anatas (TiO₂)5 samples, at most 5 grains
Barite (BaSO₄)5 samples, at most 55 grains
Pyrite (FeS₂)4 samples, at most 15 grains
Hematite (Fe₂O₃)2 samples, at most 5 grains
Kasiterit (SnO₂)2 samples, at most 1 grains
Gold (Au)1 sample, at most 3 grains
Chalcopyrite (CuFeS₂)1 sample, at most 5 grains
Cinabarit (HgS)1 sample, at most 1 grains
Nearest samples with gold
From the water1.0 km
1267
3 grains
90 m
Rock-forming and accessory minerals
Pyroxény ((Mg,Fe,Ca)₂Si₂O₆)19 samples, at most 4115 grains
Zirconium (ZrSiO₄)18 samples, at most 315 grains
Granáty ((Fe,Mg,Ca,Mn)₃Al₂Si₃O₁₂)12 samples, at most 555 grains
Korund (Al₂O₃)9 samples, at most 15 grains
Staurolit (Fe₂Al₉Si₄O₂₃(OH))3 samples, at most 5 grains
Amfiboly (Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂)3 samples, at most 55 grains
Apatit (Ca₅(PO₄)₃(F,Cl,OH))3 samples, at most 5 grains
Epidot (Ca₂(Al,Fe)₃Si₃O₁₂(OH))3 samples, at most 5 grains
Tourmalines (complex borosilicate)2 samples, at most 5 grains
Mine workings, deposits and ore occurrences
Old mine workings outside mining areas (Geofond register), deposits and mining areas, and the metallogenetic map. Gold, silver and other metals near streams can get into sediments and water.
Types of mining objects
shaft1×
Nearest old mine workings
From the water3.0 km
ShaftTypeshaftMinedrock salt
1.7 km
Deposits and mining areas
From the water5.0 km
VinnéMineralbuilding stoneStatus and organisationDeposit with halted mining or where use of reserves is not expected – Organizácia neurčená
180 m
VinnéMineralbuilding stoneStatus and organisationDeposit with halted mining or where use of reserves is not expected – Organizácia neurčená
180 m
Michalovce – Biela HoraMineralceramic claysStatus and organisationDeposit with expected use of reserves – ŠGÚDŠ Bratislava
810 m
Lom JovsaMineralbuilding stoneStatus and organisationMined deposit – VLaM SR, štátny podnik – Odštepný závod Kamenica nad Cirochou
1.5 km
Biela HoraMineralhalloysiteStatus and organisationDeposit with halted mining or where use of reserves is not expected – Organizácia neurčená
2.1 km
Biela HoraMineralceramic claysStatus and organisationDeposit with expected use of reserves – Organizácia neurčená
2.1 km
Biela HoraMineralhalloysiteStatus and organisationDeposit with halted mining or where use of reserves is not expected – Organizácia neurčená
2.1 km
Biela HoraMineralceramic claysStatus and organisationDeposit with expected use of reserves – Organizácia neurčená
2.1 km
ZbudzaMineralrock saltStatus and organisationDeposit with expected use of reserves – PROROGO, s.r.o.
2.4 km
LancoškaMineralbuilding stoneStatus and organisationMined deposit – Kalatovič Peter – Kamex-lom
2.8 km
MichalovceMineralcombustible natural gasStatus and organisationDeposit with halted mining or where use of reserves is not expected – NAFTA a.s.
3.3 km
MichalovceMineralcombustible natural gasStatus and organisationDeposit with halted mining or where use of reserves is not expected – NAFTA a.s.
3.3 km
Ore occurrences in the metallogenic map
From the water5.0 km
Trnava pri LaborciOre typeIron oresMetalsFeTypemineralogical occurrence
Is there heat underground? Geothermal potential, geothermal boreholes by temperature, mineral springs and the borehole archiveHottest borehole39 °CBoreholes762
Geothermal potential
The Atlas of Geothermal Energy of Slovakia records rock temperature and heat flow from the Earth's interior. It is the potential of the area, not the actual warmth of the water in the stream. Specific geothermal boreholes and springs near this water are in the geothermal energy section below.
Rock temperature with depth
52 / 95 °Cat depths of 1,000 and 2,000 m
increase of 43 °C per km
The line shows the rock temperature; the dotted part is only an extension to the surface. Heat flow 105 mW/m².
Geothermal groundwater bodies beneath the water line
Humenné Ridge100%SR 4.4 %
marker on the bar: share among all sample points on streams in Slovakia
Geothermal energy and mineral waters
Geothermal boreholes (wellhead water temperature, yield, chemical type) and sources of geothermal and mineral waters within 10 km. Data on the use and existence of a borehole come from the Geofond register.
Geothermal boreholes by water temperature
Kaluža – GTH-1Chemical water typeNa-Cl-SO4-HCO3/ Na-ClUsein useFrom the water2.8 km
39 °C
Sobrance – TMS-1Yield4.0 l/sDepth823 mChemical water typeCa-Na-Cl-SO4UseunusedFrom the water9.6 km
29 °C
Sources of geothermal and mineral waters
From the water10 km
category b1Typemineral waterWater temperature (°C)15-22Yield (l/s)< 5Count1
1.0 km
category a1Typemineral waterWater temperature (°C)< 15Yield (l/s)< 5Count1
5.4 km
Boreholes and Geofond archive reports
Register of hydrogeological boreholes, other boreholes and geothermal boreholes. Each borehole has a report in the Geofond archive (geological profiles, pumping tests, chemical analyses of the water); the report number is in the table.
762 boreholes in the 3 km zone, of which 158 hydrogeological and 604 other; with an archive report number 658.
Borehole depths
up to 10 m112×
10–30 m303×
30–100 m125×
100–300 m104×
over 300 m101×
Nearest boreholes
From the water3.0 km
PV-28TypedepositDepth30.7 mArchive report14679
30 m
JovsaTypestructural borehole with thermal water, mineral waterDepth250.0 mArchive report41342 117Ca38.pdf
40 m
VinnéTypenarrow-diameter borehole with ordinary drinking and process waterDepth20.5 mArchive report32877 116Db52.pdf
40 m
JovsaTypenarrow-diameter borehole with ordinary drinking and process waterDepth151.0 mArchive report70715 117Ca52.pdf
How much does the ground radiate here? Gamma radiation of rocks, radon in soil and radon in waters
Natural radioactivity and radon
Airborne gamma-ray spectrometry by ŠGÚDŠ measures radiation from potassium, uranium and thorium in rocks and soil. Granites and some acidic volcanic rocks have the highest values, limestones and floodplains the lowest. Caesium-137 is a remnant of fallout from the Chernobyl accident and nuclear weapons tests.
Gamma radiation dose rate
47nGy/h in air
range 40 to 54 nGy/h
Natural background from rocks and soil; higher over granites and some acidic volcanic rocks, lower over limestones and floodplains.
up to 50 %
50–75
75–90
90–99
above 99
Radon risk of the bedrock
medium
Radon is a natural gas from rocks. The risk concerns buildings and cellars, not the water in the stream; it shows what the bedrock is like.
dot: average along the water line, line: from the lowest to the highest value, scale: position among sample points on streams in Slovakia (0 to 100th percentile)
Areal activity of 137CsCS137523 Bq/m²percentile 5
Radon risk by isopleths
medium70%SR 64 %
low30%SR 36 %
marker on the bar: share among all sample points on streams in Slovakia
Radon in waters
Radiohydrochemical sampling of springs, wells and watercourses: radon activity concentration in water. The bar shows the highest measured value for each kind of site.
source53.7 Bq/l · median 16.0 Bq/l · 10 samples
developed spring26.0 Bq/l · median 17.7 Bq/l · 2 samples
water source for public supply22.7 Bq/l · median 13.5 Bq/l · 2 samples
free-flowing borehole with thermal and mineral water14.1 Bq/l · median 14.1 Bq/l · 1 sample
well14.0 Bq/l · median 8.64 Bq/l · 4 samples
stream, river1.29 Bq/l · median 1.06 Bq/l · 2 samples
Environmental burdens, landfills and landslides
What in the surroundings can harm the water? Environmental burdens, waste landfills, anthropogenic sediments and slope deformationsBurdens and landfills11Landslides34
Environmental burdens, landfills and anthropogenic sediments
Recorded environmental burdens (industrial sites, landfills, mining), the register of waste landfills and monitoring of anthropogenic sediments (industrial sludge). It is a list of places, not a measurement of water pollution.
Environmental burdens
From the water3.0 km
Michalovce – mestské kasárne – autoparkActivitySK1001500P
Trnava pri LaborciArea3 000 m²Year established1980Monitoring–
1.9 km
Ruský HrabovecArea150 m²Year established1980Monitoring–
2.2 km
Poruba pod VihorlatomArea1 500 m²Year established1992Monitoring–
2.5 km
KalužaYear established1982Monitoring–
2.7 km
Landslides and slope deformations
Register of documented slope deformations (Geofond). Landslides by a stream can bring fine material into the water, change the bed and dam the channel.
Types of deformations
Landslides30×
Block fields3×
Block fissures1×
Degree of activity
Potenciálny27×
Stabilizovaný6×
Aktívny1×
Current state
SD taken from archival materials, ktorá bola konfrontova17×
SD zaregistrovaná v rámci terénneho výskumu na úlohe Atlas S15×
