HydroBASINS lev08 watershed · #2080377980
Bassin de Терса
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 5 administrative regions : Balakovo, Balakovskiy rayon, Khvalynskiy rayon, Vol'sk, Vol'skiy rayon
Sub-basin area
1 988,1km²
Upstream area
1 290 950,4km²
Discharge
8 046,51m³/s
Mean elev.
93m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Волга881 km²
- Bassin de Волга34 km²
5 dept-equivalent regions (GADM L2)
- 978.6 km²49.0% of basin
- 599.3 km²30.0% of basin
- 336.8 km²16.9% of basin
- 57.0 km²2.9% of basin
- 24.0 km²1.2% of basin
11 intersecting protected areas
Hvalynskij
IUCN IINational Park
83.80 km² overlap
Urochishhe Muhin dol
IUCN IIINatural Monument
11.74 km² overlap
Natural Monument
2.87 km² overlap
Natural Monument
2.72 km² overlap
Grachevskaya lesnaya dacha
IUCN IIINatural Monument
1.70 km² overlap
Dolina strelka
IUCN IIINatural Monument
0.99 km² overlap
Samorodnye yamy
IUCN IIINatural Monument
0.98 km² overlap
Natural Monument
0.59 km² overlap
Natural Monument
0.34 km² overlap
2 more protected areassorted by overlap area
Natural Monument
0.32 km² overlap
Urochishhe Popova shishka
IUCN IIINatural Monument
0.03 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 415 distinct species · 3 389 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 31 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 Терса : 22 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 68 interactions GloBI sur 4 types (connectance 14.6%, filtre Serrano α=0.2). 9 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°
5,6°C
Annual rain
545mm
Moisture idx (CMI)
-0,30
Runoff
168mm/an
PET
781mm
AET
456mm
Mean slope
2,0°
Water table
192cm
Forest
14%
Crops
56%
Urban
5%
Protected
7%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)