HydroBASINS lev08 watershed · #2080328890
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 6 administrative regions : Arsen'evskiy rayon, Belevskiy rayon, Bolkhovskiy rayon, Kozel'skiy rayon, Suvorovskiy rayon +1
Sub-basin area
1 412,8km²
Upstream area
17 960,4km²
Discharge
104,17m³/s
Mean elev.
195m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Нугрь1542 km²
- Bassin de Иста930 km²
6 dept-equivalent regions (GADM L2)
- Belevskiy rayonTula · Russia909.0 km²64.1% of basin
- 181.1 km²12.8% of basin
- 178.4 km²12.6% of basin
- Arsen'evskiy rayonTula · Russia84.2 km²5.9% of basin
- Suvorovskiy rayonTula · Russia48.8 km²3.4% of basin
- Bolkhovskiy rayonOrel · Russia17.4 km²1.2% of basin
2 intersecting protected areas
Ugra
IUCN Not ApplicableUNESCO-MAB Biosphere Reserve
27.07 km² overlap
Kaluzhskie zaseki
IUCN IaState Natural Zapovednik
0.29 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 242 distinct species · 4 093 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 37 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 : 30 espèces reliées par 88 interactions GloBI sur 7 types (connectance 13.2%, filtre Serrano α=0.2). 7 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°
5,0°C
Annual rain
629mm
Moisture idx (CMI)
-0,07
Runoff
201mm/an
PET
678mm
AET
501mm
Mean slope
1,9°
Water table
204cm
Forest
14%
Crops
50%
Urban
1%
Protected
7%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)