HydroBASINS lev08 watershed · #2080232120
Bassin de Сясь
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 2 administrative regions : Tikhvinskiy rayon, Volkhovskiy rayon
Sub-basin area
1 478,3km²
Upstream area
7 340,1km²
Discharge
61,78m³/s
Mean elev.
47m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Луненка1038 km²
- Bassin de Луненка20 km²
2 dept-equivalent regions (GADM L2)
- 1284.9 km²86.4% of basin
- 201.7 km²13.6% of basin
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
242 distinct species · 694 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 33 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 Сясь : 26 espèces reliées par 72 interactions GloBI sur 4 types (connectance 13.6%, 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°
3,5°C
Annual rain
686mm
Moisture idx (CMI)
0,15
Runoff
266mm/an
PET
582mm
AET
444mm
Mean slope
1,2°
Water table
49cm
Forest
73%
Crops
3%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)