HydroBASINS lev08 watershed · #2080534540
Bassin de Sesia
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 across 2 countries : Aosta, Biella, Verbano-Cusio-Ossola, Vercelli, Visp
Sub-basin area
295,6km²
Upstream area
295,7km²
Discharge
9,43m³/s
Mean elev.
1 829m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
5 dept-equivalent regions (GADM L2)
- 287.7 km²97.1% of basin
- 5.2 km²1.7% of basin
- Aosta3.2 km²1.1% of basin
- 0.1 km²0.1% of basin
- Visp0.1 km²0.0% of basin
7 intersecting protected areas
Alta Valsesia e Valli Otro, Vogna, Gronda, Artogna e Sorba
IUCN Not ReportedSpecial Protection Area (Birds Directive)
163.21 km² overlap
Alta Val Sesia
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
50.03 km² overlap
Parco naturale Alta Valsesia
IUCN IVRegional/Provincial Nature Park
26.95 km² overlap
Ambienti glaciali del Gruppo del Monte Rosa
IUCN Not ReportedSpecial Protection Area (Birds Directive)
0.71 km² overlap
Ambienti glaciali del Gruppo del Monte Rosa
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.71 km² overlap
Val Sessera
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.56 km² overlap
Monte Rosa
IUCN Not ReportedSpecial Protection Area (Birds Directive)
0.46 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 694 distinct species · 5 811 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 28 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 Sesia : 24 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) + 4 bulles famille, 39 interactions GloBI documentées sur 4 types (connectance 10.3%, filtre Serrano α=0.2). Les 4 bulles regroupent des espèces visuellement absorbées par famille (≥3 espèces visibles).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
3,2°C
Annual rain
1 446mm
Moisture idx (CMI)
0,59
Runoff
1 008mm/an
PET
548mm
AET
539mm
Mean slope
29,0°
Water table
966cm
Forest
61%
Crops
2%
Urban
0%
Protected
9%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)