HydroBASINS lev08 watershed · #2080434780
Bassin de San
A watershed (drainage basin) is not a body of water — it is the land area where rainfall converges towards a single river that eventually reaches the sea (or an endorheic basin). Boundaries follow ridgelines.
Crosses 16 administrative regions across 3 countries : Bieszczady, Brzozów, Humenné, Jarosław, Lesko +11
Sub-basin area
3 674,8km²
Upstream area
3 674,8km²
Discharge
32,7m³/s
Mean elev.
521m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
16 dept-equivalent regions (GADM L2)
- Sanok906.2 km²24.6% of basin
- Lesko822.2 km²22.3% of basin
- 747.7 km²20.3% of basin
- 658.4 km²17.9% of basin
- Brzozów236.3 km²6.4% of basin
- 151.9 km²4.1% of basin
- 112.7 km²3.1% of basin
- 29.2 km²0.8% of basin
8 moreFull L2 list
- Velykobereznians'kyi5.4 km² · 0.1%
- Starosambirs'kyi5.0 km² · 0.1%
- Snina4.7 km² · 0.1%
- Medzilaborce3.9 km² · 0.1%
- Jarosław2.4 km² · 0.1%
- Przeworsk0.9 km² · 0.0%
- Strzyżów0.0 km² · 0.0%
- Humenné0.0 km² · 0.0%
30 intersecting protected areas
Bieszczady
IUCN Not ReportedSpecial Protection Area (Birds Directive)
1092.82 km² overlap
Bieszczady
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1092.82 km² overlap
Wschodniobeskidzki Obszar Chronionego Krajobrazu
IUCN Not AssignedProtected Landscape Area
855.51 km² overlap
Landscape Park
502.02 km² overlap
Pogórze Przemyskie
IUCN Not ReportedSpecial Protection Area (Birds Directive)
486.97 km² overlap
Landscape Park
458.69 km² overlap
Przemysko-Dynowski Obszar Chronionego Krajobrazu
IUCN Not AssignedProtected Landscape Area
325.12 km² overlap
Landscape Park
306.32 km² overlap
Góry Słonne
IUCN Not ReportedSpecial Protection Area (Birds Directive)
297.46 km² overlap
21 more protected areassorted by overlap area
Bieszczadzki Park Narodowy
IUCN IINational Park
282.17 km² overlap
Landscape Park
277.19 km² overlap
Obszar Chronionego Krajobrazu Beskidu Niskiego
IUCN Not AssignedProtected Landscape Area
249.53 km² overlap
Ostoja Góry Słonne
IUCN Not ReportedSite of Community Importance (Habitats Directive)
247.25 km² overlap
Ostoja Przemyska
IUCN Not ReportedSite of Community Importance (Habitats Directive)
230.80 km² overlap
Nadsianskyi
IUCN Not ReportedRegional landscape park
109.47 km² overlap
Nadsianskyi Regional Landscape Park
IUCN Not ReportedEmerald Network
106.55 km² overlap
Beskid Niski
IUCN Not ReportedSpecial Protection Area (Birds Directive)
97.11 km² overlap
Boikivshchyna
IUCN Not ReportedNational nature park
33.93 km² overlap
Ostoja Jaśliska
IUCN Not ReportedSite of Community Importance (Habitats Directive)
28.72 km² overlap
Landscape Park
27.86 km² overlap
Dorzecze Górnego Sanu
IUCN Not ReportedSite of Community Importance (Habitats Directive)
15.79 km² overlap
Rzeka San
IUCN Not ReportedSite of Community Importance (Habitats Directive)
10.87 km² overlap
Hyżnieńsko-Gwoźnicki Obszar Chronionego Krajobrazu
IUCN Not AssignedProtected Landscape Area
9.79 km² overlap
Krywe
IUCN IVNature Reserve
5.14 km² overlap
Nature Reserve
4.84 km² overlap
Sine Wiry
IUCN IVNature Reserve
4.44 km² overlap
Nature Reserve
3.20 km² overlap
Przysłup
IUCN Not AssignedNature Reserve
2.13 km² overlap
Kościół w Dydni
IUCN Not ReportedSite of Community Importance (Habitats Directive)
1.98 km² overlap
Nature Reserve
1.91 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
5 997 distinct species · 162 230 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 31 species (selected proportionally per kingdom among those with at least one documented interaction here) to keep the graph readable. Hover for details, click to explore the full ecosystem of a species.
ℹ️ The territory contains many more species than displayed and all their documented interactions: the graph is intentionally the structural skeleton (top-N species by composite local score, edges filtered by Serrano 2009 disparity filter α=0.2).
Indicateurs du tissu écologique
Tissu écologique de Bassin de San : 17 espèces reliées par 65 interactions GloBI sur 4 types (connectance 13.1%, filtre Serrano α=0.2). 15 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
6,0°C
Annual rain
749mm
Moisture idx (CMI)
0,05
Runoff
261mm/an
PET
701mm
AET
584mm
Mean slope
7,9°
Water table
416cm
Forest
87%
Crops
10%
Urban
2%
Protected
84%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)