HydroBASINS lev08 watershed · #4080100200
Bassin de Сомня
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 3 administrative regions : Tuguro-Chumikanskiy rayon, Ul'chskiy rayon, im. Poliny Osipenko rayon
Sub-basin area
2 454,2km²
Upstream area
2 454,3km²
Discharge
12,94m³/s
Mean elev.
286m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
3 dept-equivalent regions (GADM L2)
- im. Poliny Osipenko rayonKhabarovsk · Russia1969.6 km²79.9% of basin
- Tuguro-Chumikanskiy rayonKhabarovsk · Russia341.0 km²13.8% of basin
- Ul'chskiy rayonKhabarovsk · Russia153.6 km²6.2% of basin
2 intersecting protected areas
Reka Somnya
IUCN IIINatural Monument
120.70 km² overlap
Reka Omal
IUCN IIINatural Monument
3.24 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
102 distinct species · 126 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 9 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 Сомня : 9 espèces reliées par 6 interactions GloBI sur 1 type (connectance 16.7%, filtre Serrano α=0.2).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
-3,1°C
Annual rain
579mm
Moisture idx (CMI)
0,03
Runoff
183mm/an
PET
562mm
AET
441mm
Mean slope
9,4°
Water table
189cm
Forest
53%
Crops
0%
Urban
0%
Protected
5%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)