HydroBASINS lev08 watershed · #2080313350
Bassin de Осьма
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 5 administrative regions : Dorogobuzhskiy rayon, El'ninskiy rayon, Safonovskiy rayon, Ugranskiy rayon, Vyazemskiy rayon
Sub-basin area
1 437,6km²
Upstream area
1 437,9km²
Discharge
9,07m³/s
Mean elev.
225m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
5 dept-equivalent regions (GADM L2)
- Dorogobuzhskiy rayonSmolensk · Russia761.7 km²52.7% of basin
- Vyazemskiy rayonSmolensk · Russia398.1 km²27.6% of basin
- Safonovskiy rayonSmolensk · Russia281.7 km²19.5% of basin
- Ugranskiy rayonSmolensk · Russia2.1 km²0.1% of basin
- El'ninskiy rayonSmolensk · Russia0.6 km²0.0% of basin
4 intersecting protected areas
Ugranskij
IUCN IVState Natural Zakaznik
9.27 km² overlap
Aleksino
IUCN IVState Natural Zakaznik
4.00 km² overlap
Lipovyj park u derevni Brazhino
IUCN IIINatural Monument
0.03 km² overlap
Ozero Semlyovskoe (Stoyachee)
IUCN IIINatural Monument
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
236 distinct species · 421 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 40 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 Осьма : 31 espèces reliées par 79 interactions GloBI sur 6 types (connectance 10.1%, filtre Serrano α=0.2). 9 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°
4,5°C
Annual rain
630mm
Moisture idx (CMI)
-0,02
Runoff
199mm/an
PET
645mm
AET
493mm
Mean slope
1,3°
Water table
128cm
Forest
71%
Crops
12%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)