HydroBASINS lev08 watershed · #2080346650
Bassin de Nareśl
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 2 administrative regions : Białystok, Mońki
Sub-basin area
634,9km²
Upstream area
6 763,7km²
Discharge
35,88m³/s
Mean elev.
134m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Supraśl1832 km²
- Bassin de Narew1195 km²
2 dept-equivalent regions (GADM L2)
- 424.8 km²66.6% of basin
- 212.7 km²33.4% of basin
10 intersecting protected areas
Puszcza Knyszyńska
IUCN Not ReportedSpecial Protection Area (Birds Directive)
69.00 km² overlap
Dolina Narwi
IUCN Not AssignedProtected Landscape Area
61.42 km² overlap
Ostoja Knyszyńska
IUCN Not ReportedSite of Community Importance (Habitats Directive)
59.67 km² overlap
Landscape Park
36.88 km² overlap
Ostoja Narwiańska
IUCN Not ReportedSite of Community Importance (Habitats Directive)
36.78 km² overlap
Ostoja Biebrzańska
IUCN Not ReportedSpecial Protection Area (Birds Directive)
36.73 km² overlap
Dolina Biebrzy
IUCN Not ReportedSite of Community Importance (Habitats Directive)
36.73 km² overlap
Wielki Las
IUCN IVNature Reserve
1.05 km² overlap
Szelągówka
IUCN IVNature Reserve
0.24 km² overlap
1 more protected areassorted by overlap area
Kulikówka
IUCN IVNature Reserve
0.10 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 423 distinct species · 64 912 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 30 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 Nareśl : 25 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 45 interactions GloBI sur 4 types (connectance 10.3%, filtre Serrano α=0.2). 5 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°
6,7°C
Annual rain
574mm
Moisture idx (CMI)
-0,19
Runoff
147mm/an
PET
705mm
AET
485mm
Mean slope
1,0°
Water table
132cm
Forest
16%
Crops
45%
Urban
1%
Protected
16%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)