HydroBASINS lev08 watershed · #2080298790
Bassin de Свияга
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 : Apastovskiy rayon, Kozlovskiy rayon, Urmarskiy rayon, Verkhneuslonskiy rayon, Zelenodol'skiy rayon
Sub-basin area
1 566,7km²
Upstream area
18 046,6km²
Discharge
67,5m³/s
Mean elev.
125m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Улема2129 km²
- Bassin de Кубня35 km²
5 dept-equivalent regions (GADM L2)
- 712.9 km²45.3% of basin
- 551.1 km²35.0% of basin
- 172.3 km²10.9% of basin
- 129.3 km²8.2% of basin
- 8.5 km²0.5% of basin
10 intersecting protected areas
Lesnoj klyuch
IUCN IVState Natural Zakaznik
172.05 km² overlap
Sviyazhskij
IUCN IVState Natural Zakaznik
121.81 km² overlap
Sviyazhsky / Great Volzhsko-Kamsky (part of)
IUCN Not ApplicableUNESCO-MAB Biosphere Reserve
77.41 km² overlap
Great Volzhsko-Kamsky
IUCN Not ApplicableUNESCO-MAB Biosphere Reserve
77.41 km² overlap
Volzhskie prostory
IUCN IVState Natural Zakaznik
9.08 km² overlap
Reka Sviyaga
IUCN IIINatural Monument
8.51 km² overlap
Zoostanciya KGU - massiv Dachnyj
IUCN IIINatural Monument
1.87 km² overlap
Reka Sulica
IUCN IIINatural Monument
1.14 km² overlap
Kuralovskie rodniki
IUCN IIINatural Monument
0.95 km² overlap
1 more protected areassorted by overlap area
Ozero Ozero
IUCN IIINatural Monument
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
922 distinct species · 3 630 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 38 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 Свияга : 28 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 94 interactions GloBI sur 4 types (connectance 13.4%, filtre Serrano α=0.2). 10 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°
3,6°C
Annual rain
544mm
Moisture idx (CMI)
-0,17
Runoff
156mm/an
PET
652mm
AET
454mm
Mean slope
2,1°
Water table
157cm
Forest
5%
Crops
64%
Urban
1%
Protected
5%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)