HydroBASINS lev08 watershed · #2080164520
Bassin de Namsen
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 7 administrative regions across 2 countries : Bindal, Grane, Hattfjelldal, Høylandet, Namsskogan +2
Sub-basin area
1 903,5km²
Upstream area
1 903,6km²
Discharge
72,41m³/s
Mean elev.
609m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
7 dept-equivalent regions (GADM L2)
- 945.8 km²49.4% of basin
- 542.0 km²28.3% of basin
- 233.5 km²12.2% of basin
- 158.0 km²8.2% of basin
- 32.5 km²1.7% of basin
- 2.7 km²0.1% of basin
- 1.5 km²0.1% of basin
10 intersecting protected areas
Børgefjell/Byrkije
IUCN IINational Park
675.35 km² overlap
Børgefjell
IUCN Not ReportedEmerald Network
675.35 km² overlap
Storbjørhusdal
IUCN IaNature Reserve
10.23 km² overlap
Storbjørhusdal
IUCN Not ReportedEmerald Network
10.23 km² overlap
Mellingsdalen
IUCN IaNature Reserve
8.03 km² overlap
Rubben
IUCN IaNature Reserve
4.97 km² overlap
Bjurälven-Korallgrottan
IUCN IbNatura 2000 SCI
1.39 km² overlap
Bjurälven-Korallgrottan
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.39 km² overlap
2001192 Bjurälven
IUCN IbNature Reserve
1.39 km² overlap
1 more protected areassorted by overlap area
2047179 Skåarnja
IUCN IbNature Reserve
0.36 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 134 distinct species · 40 323 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 48 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 Namsen : 36 espèces dont 5 patrimoniales (LR IUCN CR/EN/VU) reliées par 105 interactions GloBI sur 5 types (connectance 9.3%, filtre Serrano α=0.2). 12 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°
1,8°C
Annual rain
1 396mm
Moisture idx (CMI)
0,71
Runoff
1 198mm/an
PET
398mm
AET
392mm
Mean slope
9,9°
Water table
312cm
Forest
38%
Crops
0%
Urban
0%
Protected
36%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)