HydroBASINS lev08 watershed · #2080282690
Bassin de Ока
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 1 administrative regions : Toropetskiy rayon
Sub-basin area
362,5km²
Upstream area
362,6km²
Discharge
3,36m³/s
Mean elev.
180m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
1 dept-equivalent regions (GADM L2)
- Toropetskiy rayonTver' · Russia364.3 km²100.0% of basin
10 intersecting protected areas
Boloto Vojlovskie vorota
IUCN IVState Natural Zakaznik
8.91 km² overlap
State Natural Zakaznik
7.17 km² overlap
Boloto Krasnyj Moh
IUCN IVState Natural Zakaznik
6.47 km² overlap
Bolota vdol` reki Oki
IUCN IVState Natural Zakaznik
5.93 km² overlap
Kulino-Karpasovskij bor
IUCN IIINatural Monument
5.87 km² overlap
Boloto Urochishhe Krest
IUCN IVState Natural Zakaznik
4.16 km² overlap
Boloto Zajcevskoe
IUCN IVState Natural Zakaznik
2.54 km² overlap
Boloto Urochishhe Kosariha
IUCN IVState Natural Zakaznik
2.03 km² overlap
Boloto Sterezhenskoe
IUCN IVState Natural Zakaznik
0.96 km² overlap
1 more protected areassorted by overlap area
Boloto Dolzhinskoe
IUCN IVState Natural Zakaznik
0.69 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
173 distinct species · 242 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 28 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 Ока : 22 espèces dont 3 patrimoniales (LR IUCN CR/EN/VU) reliées par 63 interactions GloBI sur 4 types (connectance 16.7%, filtre Serrano α=0.2). 6 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°
4,2°C
Annual rain
624mm
Moisture idx (CMI)
-0,02
Runoff
291mm/an
PET
638mm
AET
487mm
Mean slope
1,3°
Water table
119cm
Forest
95%
Crops
3%
Urban
0%
Protected
7%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)