HydroBASINS lev08 watershed · #2080296140
Bassin de Обша
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 : Bel'skiy rayon, Nelidovskiy rayon, Zharkovskiy rayon
Sub-basin area
435,9km²
Upstream area
2 048,3km²
Discharge
15,06m³/s
Mean elev.
201m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Обша1114 km²
- Bassin de Нача499 km²
3 dept-equivalent regions (GADM L2)
- Nelidovskiy rayonTver' · Russia187.0 km²42.7% of basin
- Zharkovskiy rayonTver' · Russia125.9 km²28.7% of basin
- Bel'skiy rayonTver' · Russia125.1 km²28.6% of basin
7 intersecting protected areas
Nesterovskij
IUCN IVState Natural Zakaznik
95.26 km² overlap
Boloto Potahovskij Moh
IUCN IVState Natural Zakaznik
18.25 km² overlap
ZHarkovskij
IUCN IVState Natural Zakaznik
4.84 km² overlap
Boloto Pochinkovskij Moh
IUCN IVState Natural Zakaznik
4.43 km² overlap
Ozero Baltika
IUCN IIINatural Monument
0.05 km² overlap
Ozero Gorodskoe
IUCN IIINatural Monument
0.04 km² overlap
Ozero CHertovo
IUCN IIINatural Monument
0.03 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
174 distinct species · 189 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 39 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 Обша : 31 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 53 interactions GloBI sur 6 types (connectance 7.2%, 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°
4,4°C
Annual rain
640mm
Moisture idx (CMI)
0,00
Runoff
248mm/an
PET
638mm
AET
489mm
Mean slope
1,0°
Water table
81cm
Forest
73%
Crops
10%
Urban
1%
Protected
26%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)