HydroBASINS lev08 watershed · #2080346160
Bassin de Wissa
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 7 administrative regions : Białystok, Ełk, Grajewo, Kolno, Mońki +2
Sub-basin area
1 151,6km²
Upstream area
7 087,7km²
Discharge
37,55m³/s
Mean elev.
129m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Ełk1431 km²
- Bassin de Biebrza109 km²
7 dept-equivalent regions (GADM L2)
- 476.9 km²41.2% of basin
- 362.5 km²31.3% of basin
- 196.1 km²17.0% of basin
- 56.1 km²4.9% of basin
- Pisz49.5 km²4.3% of basin
- 10.4 km²0.9% of basin
- 4.8 km²0.4% of basin
8 intersecting protected areas
Ostoja Biebrzańska
IUCN Not ReportedSpecial Protection Area (Birds Directive)
375.42 km² overlap
Dolina Biebrzy
IUCN Not ReportedSite of Community Importance (Habitats Directive)
374.84 km² overlap
Biebrzanski National Park
IUCN IIWetland of International Importance (Ramsar Site)
230.94 km² overlap
Biebrzański Park Narodowy
IUCN Not AssignedNational Park
230.89 km² overlap
Wzgórz Dybowskich
IUCN Not AssignedProtected Landscape Area
28.90 km² overlap
Ławski Las I
IUCN IVNature Reserve
1.09 km² overlap
Ławski Las II
IUCN IVNature Reserve
0.75 km² overlap
Szelągówka
IUCN IVNature Reserve
0.38 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 504 distinct species · 153 540 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 26 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 Wissa : 19 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 48 interactions GloBI sur 3 types (connectance 13.7%, filtre Serrano α=0.2). 8 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°
6,8°C
Annual rain
583mm
Moisture idx (CMI)
-0,17
Runoff
155mm/an
PET
702mm
AET
491mm
Mean slope
0,9°
Water table
100cm
Forest
15%
Crops
42%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)