Fishing conditions score, the best window of the day and fishing districts from the best conditions Low activity · average of one fishing district 15:00–17:00 OR Moravský Svätý Ján – horné, window score 23. The score is an estimate of conditions based on weather, water and surroundings, not a bite forecast. Recalculated at 04:04. The course of the watercourse and its fishing districts. You can switch the line color to today's conditions, quality or any other parameter. Detailed filtersregion, district, riverbed, depth, shading, satellites, water chemistry and pollution, fish, geology Move the map with two fingers. In full-screen mode one finger is enough. 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. Terrain height along the fishing district and the approximate water level. Still water This is standing water, 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. Source: Open Topo Data (eudem25m), 4 Nov 2026. The height is approximate (error of a few metres). Loading the 3D terrain model… Changes in the surroundings and nature from 2017 to 2023: how the banks, vegetation and landscape around the water change. The images switch automatically; you can also browse them by hand. Orthophoto mosaic of Slovakia © GKÚ Bratislava, NLC Zvolen. The year and day of imaging depend on the location, so individual years may differ in season and weather. Water quality according to SHMÚ, wastewater treatment plants near the fishing districts and groundwater nearby 1 of 1 fishing districts on the watercourse with SHMÚ data: the nearest site has an unmet standard in at least one indicator. 1 of 1 fishing district with measurements has groundwater nearby with a value above the limit for at least one indicator. Water pollution in the Morava basinPolluted water in Slovakia 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. Metals and gold in river sediments and water, old mine workings and deposits, boreholes with archive reports, geothermal energy, environmental burdens and landslides around the stream 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 (1 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. River alluvium100% of the water line Gravelly and sandy bottom and floodplains; the water is replenished from groundwater in the alluvium. Geological Map of Slovakia 1:50,000. pH 8.0modelled estimate water type Ca–HCO₃ Mineralisation 421 mg/l, moderately hard water (12.0 °dH). Interpolation of measurements from the Geochemical Atlas of Slovakia, not a measurement in the stream. 0 from 15elements in the top 10 % highest: Selenium 0.207 mg/kg Position of the highest-ranked element among the sample points on streams in Slovakia: percentile 40. Interpolation of the Geochemical Atlas of river sediments. 45°C at 1,000 m depth heat flow 50 mW/m² At a depth of 2,000 m about 75 °C (increase of 30 °C per kilometre). Atlas of Geothermal Energy of Slovakia. 51nGy/h dose rate percentile 58 in Slovakia Natural background from rocks and soil (potassium, uranium, thorium), not a value measured at the water. Airborne gamma-ray spectrometry by ŠGÚDŠ. 0objects within 3 km No old mine working is recorded within 3 km of the water. 0samples with gold No gold was found in river sediment samples within 1 km of the water. The samples do not cover every stream, so this does not mean there is no gold here. 0 from 9indicators in the top 5 % highest: Copper 4.30 μg/l Position of the highest measured value in the distribution of all surface water samples in Slovakia: percentile 89 (mŕtve rameno rieky Morava, lok. Rozpad). 55boreholes within 3 km 3 water analyses nearby Of these, 49 have an archive report from Geofond. The boreholes are hydrogeological, geological, engineering-geological and other. – No geothermal borehole or spring is recorded within 10 km. 0sites within 3 km No environmental burden is registered within 3 km; landfills are only recorded. 4records within 5 km 2 deposits, 2 ore occurrences Geofond registers, the metallogenetic map and the mineral resources map. 0areas within 3 km Documented landslides in the Geofond register. A landslide into a stream can cloud the water and change the bed. 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. 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. marker on the bar: share among all sample points on streams in Slovakia marker on the bar: share among all sample points on streams in Slovakia marker on the bar: share among all sample points on streams in Slovakia marker on the bar: share among all sample points on streams in Slovakia marker on the bar: share among all sample points on streams in Slovakia marker on the bar: share among all sample points on streams in Slovakia marker on the bar: share among all sample points on streams in Slovakia marker on the bar: share among all sample points on streams in Slovakia marker on the bar: share among all sample points on streams in Slovakia marker on the bar: share among all sample points on streams in Slovakia The map covers 1 of 1 points on the water line. 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. marker on the bar: share among all sample points on streams in Slovakia marker on the bar: share among all sample points on streams in Slovakia marker on the bar: share among all sample points on streams in Slovakia 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. pH 7.96typical 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. 12.0°dH, moderately hard Sum of calcium and magnesium (2.15 mmol/l). Hard water is buffered and its pH changes more slowly; soft water is more sensitive to acid rain. 421mg/l mineralisation Total amount of dissolved minerals. Clean mountain water has tens of mg/l, lowland and limestone waters hundreds. Water type by dominant ions: Ca–HCO₃ Shares are in equivalents, the usual way of comparing the composition of waters. 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) 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. 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) 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. 51nGy/h in air Natural background from rocks and soil; higher over granites and some acidic volcanic rocks, lower over limestones and floodplains. 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) 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. 45 / 75 °Cat depths of 1,000 and 2,000 m increase of 30 °C per km The line shows the rock temperature; the dotted part is only an extension to the surface. Heat flow 50 mW/m². 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. marker on the bar: share among all sample points on streams in Slovakia marker on the bar: share among all sample points on streams in Slovakia marker on the bar: share among all sample points on streams in Slovakia marker on the bar: share among all sample points on streams in Slovakia marker on the bar: share among all sample points on streams in Slovakia marker on the bar: share among all sample points on streams in Slovakia 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. 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. Highest value: mŕtve rameno rieky Morava, lok. Rozpad2003, 260 m from the water. Comparison: percentile 89 of all samples in Slovakia. Highest value: mŕtve rameno rieky Morava, lok. Rozpad2003, 260 m from the water. Comparison: percentile 87 of all samples in Slovakia. Highest value: mŕtve rameno rieky Morava, lok. Rozpad2003, 260 m from the water. Comparison: percentile 83 of all samples in Slovakia. Highest value: mŕtve rameno rieky Morava, lok. Rozpad2003, 260 m from the water. Comparison: percentile 82 of all samples in Slovakia. Highest value: mŕtve rameno rieky Morava, lok. Rozpad2003, 260 m from the water. Comparison: percentile 78 of all samples in Slovakia. Highest value: mŕtve rameno rieky Morava, lok. Rozpad2003, 260 m from the water. Comparison: percentile 46 of all samples in Slovakia. Highest value: mŕtve rameno rieky Morava, lok. Rozpad2003, 260 m from the water. Comparison: percentile 43 of all samples in Slovakia. Highest value: mŕtve rameno rieky Morava, lok. Rozpad2003, 260 m from the water. Comparison: percentile 34 of all samples in Slovakia. Highest value: mŕtve rameno rieky Morava, lok. Rozpad, 260 m from the water. Comparison: percentile 26 of all samples in Slovakia. Basic water chemistry: which rocks the minerals in it come from. Highest value: mŕtve rameno rieky Morava, lok. Rozpad2003, 260 m from the water. Comparison: percentile 6 of all samples in Slovakia. Hydrogeochemical objects (analyses of springs and boreholes), the geochemical atlas of groundwater (1996) and radiohydrochemical sampling. Groundwater feeds streams, so its composition also affects the water in the stream. 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. 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. 55 boreholes in the 3 km zone, of which 3 hydrogeological and 52 other; with an archive report number 49. Data: © ŠGÚDŠ (https://www.geology.sk), downloaded 8 Nov 2026. Details in the Methodology. Who manages the fishing districts and where they are Danube basin
By the water now
Today on the OR Moravský Svätý Ján – horné watercourse
Average of the watercourse's fishing districts
Best window today
Map and fishing districts of the watercourse
Elevation profile: standing water
Terrain in 3D
Historical images
Water pollution on the OR Moravský Svätý Ján – horné watercourse
Surface water near the fishing districtsnearest SHMÚ monitoring site, 2025
Most polluted fishing districtsall with an unmet standard
Groundwater: measured valuestypical value from stations within 10 km, 2025
Geology and geochemistry of the OR Moravský Svätý Ján – horné stream
Rock under the water
Water according to the atlas
Elements in river sediment
Heat underfoot
Natural gamma radiation
Old mine workings
Gold in river sediment
Trace elements in the stream water
Boreholes and groundwater analyses
Geothermal energy
Environmental burdens and landfills
Deposits and ore occurrences
Landslides and slope deformations
Geological structure beneath the water
Geological age of the rocks
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 1× Quaternary cover
Tectonic division
Neotectonic units
Direction of neotectonic movements
Regional geological division
Regional geological division (subunits)
Engineering-geological districts
Engineering-geological formations
Susceptibility of the area to slope deformations
Hydrogeology: aquifers and groundwater
Type of permeability (basic hydrogeological map 1:50,000)
Hydrogeological function
Main hydrogeological region
Surface water chemistry according to the atlas
Water acidity
Water hardness
Dissolved substances
Ionic composition of the water
Major ions
0.273 mg/lpercentile 918.92 mg/lpercentile 9143.2 mg/lpercentile 8827.3 mg/lpercentile 8847.8 mg/lpercentile 5916.4 mg/lpercentile 54200 mg/lpercentile 4559.0 mg/lpercentile 45Nutrients and organic pollution
16.9 mg/lpercentile 963.26 mg/lpercentile 9511.6 mg/lpercentile 780.407 mg/lpercentile 76Metals
501 μg/lpercentile 9527.8 μg/lpercentile 920.409 mg/lpercentile 9073.5 μg/lpercentile 53Elements in river sediments
Potentially toxic and trace elements
0.207 mg/kgpercentile 4062.1 mg/kgpercentile 3318.9 mg/kgpercentile 256.76 mg/kgpercentile 230.0838 mg/kgpercentile 2010.9 mg/kgpercentile 181.93 mg/kgpercentile 180.200 mg/kgpercentile 1614.6 mg/kgpercentile 100.107 mg/kgpercentile 80.0415 mg/kgpercentile 842.7 mg/kgpercentile 549.3 mg/kgpercentile 42.32 mg/kgpercentile 30.118 mg/kgpercentile 1Major elements (iron, aluminium, calcium, magnesium, potassium, sodium, titanium, manganese, phosphorus)
0.772 %percentile 301.21 %percentile 213,665 mg/kgpercentile 201.28 %percentile 17525 mg/kgpercentile 103.97 %percentile 5434 mg/kgpercentile 51.38 %percentile 40.392 %percentile 3Further elements (barium, strontium, lithium, rubidium, zirconium, yttrium, cerium, boron, beryllium, gallium)
748 mg/kgpercentile 9613.7 mg/kgpercentile 47411 mg/kgpercentile 4024.6 mg/kgpercentile 33115 mg/kgpercentile 3078.7 mg/kgpercentile 260.954 mg/kgpercentile 2550.5 mg/kgpercentile 2043.9 mg/kgpercentile 1419.0 mg/kgpercentile 5Natural radioactivity and radon
Gamma radiation dose rate
8.82 ppm82th percentile1.27 %percentile 352.19 ppm14th percentile1,490 Bq/m²percentile 49Geothermal potential
Rock temperature with depth
Relief, climate and soils
Geomorphological units
Geomorphological regions
Climatic-geographical types
Susceptibility of soils to acidification
Soil contamination (map 1:500,000)
Lithogeochemical types
Map of the corridor
Trace elements in surface waters
Major ions, mineralisation and pH
Groundwater: chemistry, water types and radioactivity
Radon in waters
Type of site Samples Highest radon Median stream, river 2 0,760 Bq/l 0.410 Bq/l well 1 9,28 Bq/l 9.28 Bq/l Mine workings, deposits and ore occurrences
Deposits and mining areas
Deposit Mineral Status and organisation From the water Moravský Svätý Ján – Gergelík I gravelly sands and sands Mined deposit – SAND plus s.r.o. 3.0 km Moravský Svätý Ján – Gergelík gravelly sands and sands Mined deposit – SAND plus, s.r.o. 3.2 km Boreholes and Geofond archive reports
Borehole depths
Nearest boreholes
Site Type Depth Archive report From the water km 44.650k engineering-geological 15.0 m 84381470 m km 44.650p engineering-geological 5.0 m 84381490 m km 44.850p engineering-geological 12.0 m 84381580 m J-20 engineering-geological 20.0 m 83719690 m J-19 engineering-geological 20.0 m 83719690 m J-22 engineering-geological 20.0 m 83719700 m J-18 engineering-geological 20.0 m 83719700 m B-IV engineering-geological 20.0 m 85822700 m B-III engineering-geological 25.0 m 85822710 m J-21 engineering-geological 20.0 m 83719710 m J-24 engineering-geological 30.0 m 83719720 m B-II engineering-geological 25.0 m 85822720 m How to read these data
Organizations and location
Organizations on the watercoursewho manages the fishing districts and what the conditions are there today
More watercourses nearby
15from 100
1445fishing districts
Map color
Loading map…
lowerhigher
Cations (positive ions)
Anions (negative ions)
CopperCuslightly elevated
highest 4.30 μg/lmedian 4.30 μg/l1 sample
ChromiumCrslightly elevated
highest 4.00 μg/lmedian 4.00 μg/l1 sample
ArsenicAsslightly elevated
highest 3.00 μg/lmedian 3.00 μg/l1 sample
AntimonySbslightly elevated
highest 1.00 μg/lmedian 1.00 μg/l1 sample
BariumBaslightly elevated
highest 71.0 μg/lmedian 71.0 μg/l1 sample
SeleniumSebelow half of Slovakia
highest 0.500 μg/lmedian 0.500 μg/l1 sample100 % below the limit of quantification
LeadPbbelow half of Slovakia
highest 2.50 μg/lmedian 2.50 μg/l1 sample100 % below the limit of quantification
LithiumLibelow half of Slovakia
highest 5.00 μg/lmedian 5.00 μg/l1 sample100 % below the limit of quantification
CadmiumCdbelow half of Slovakia
highest 0.150 μg/lmedian 0.150 μg/l1 sample100 % below the limit of quantification
Silicon dioxideSiO2below half of Slovakia
highest 2.92 mg/lmedian 2.92 mg/l1 sample
