HydroBASINS lev08 watershed · #2080167850
Bassin de Nesåa
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 : Grong, Høylandet, Lierne, Namsskogan, Røyrvik
Sub-basin area
1 097,2km²
Upstream area
3 509,2km²
Discharge
132,1m³/s
Mean elev.
407m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Namsen1904 km²
- Bassin de Tunnsjøelva508 km²
5 dept-equivalent regions (GADM L2)
- 649.7 km²58.8% of basin
- 363.1 km²32.9% of basin
- 54.9 km²5.0% of basin
- 36.5 km²3.3% of basin
- 0.1 km²0.0% of basin
14 intersecting protected areas
Finntjønndalen
IUCN IaNature Reserve
13.43 km² overlap
Migaren
IUCN IaNature Reserve
5.11 km² overlap
Råbesdalen
IUCN IaNature Reserve
3.03 km² overlap
Forrotjønna
IUCN IaNature Reserve
2.41 km² overlap
Ausvasstormyra
IUCN IaNature Reserve
2.26 km² overlap
Gartlandselva
IUCN Not ReportedEmerald Network
1.42 km² overlap
Gartlandselva
IUCN IaNature Reserve
1.42 km² overlap
Aurstadklumpen
IUCN IaNature Reserve
1.32 km² overlap
Fiskumfoss
IUCN IaNature Reserve
0.56 km² overlap
5 more protected areassorted by overlap area
Solumsmoen
IUCN IaNature Reserve
0.46 km² overlap
Solem
IUCN IaNature Reserve
0.45 km² overlap
Medjåurda
IUCN IaNature Reserve
0.35 km² overlap
Øvermoen
IUCN IaNature Reserve
0.26 km² overlap
Sandtjønnhaugen
IUCN IaNature Reserve
0.22 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 612 distinct species · 26 420 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 37 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 Nesåa : 27 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 124 interactions GloBI sur 7 types (connectance 18.6%, 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°
3,0°C
Annual rain
1 428mm
Moisture idx (CMI)
0,70
Runoff
1 215mm/an
PET
422mm
AET
414mm
Mean slope
9,8°
Water table
318cm
Forest
49%
Crops
0%
Urban
0%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)