HydroBASINS lev08 watershed · #2080300040
Bassin de Межа
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 4 administrative regions : Demidovskiy rayon, Velizhskiy rayon, Zapadnodvinskiy rayon, Zharkovskiy rayon
Sub-basin area
410,4km²
Upstream area
9 525,4km²
Discharge
74,36m³/s
Mean elev.
184m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Ельша1483 km²
- Bassin de Межа1456 km²
4 dept-equivalent regions (GADM L2)
- Zapadnodvinskiy rayonTver' · Russia321.8 km²78.0% of basin
- Velizhskiy rayonSmolensk · Russia73.6 km²17.8% of basin
- Zharkovskiy rayonTver' · Russia16.6 km²4.0% of basin
- Demidovskiy rayonSmolensk · Russia0.4 km²0.1% of basin
5 intersecting protected areas
Boloto Smorgun
IUCN IVState Natural Zakaznik
16.21 km² overlap
Boloto Ozernoe
IUCN IVState Natural Zakaznik
15.47 km² overlap
Smolemsk Lakeland
IUCN Not ApplicableUNESCO-MAB Biosphere Reserve
4.55 km² overlap
Boloto u d. Mosyagino
IUCN IVState Natural Zakaznik
0.95 km² overlap
Boloto Osinovyj ostrov
IUCN IVState Natural Zakaznik
0.30 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
5 distinct species · 7 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 2 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 Межа : 2 espèces reliées par 1 interaction GloBI sur 1 type (connectance 100.0%, 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°
4,7°C
Annual rain
637mm
Moisture idx (CMI)
-0,01
Runoff
263mm/an
PET
645mm
AET
491mm
Mean slope
1,0°
Water table
73cm
Forest
86%
Crops
6%
Urban
0%
Protected
17%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)