HydroBASINS lev08 watershed · #2080167530
Bassin de Folldalselva
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 : Fosnes, Grong, Høylandet, Namsos, Namsskogan +2
Sub-basin area
694,7km²
Upstream area
694,7km²
Discharge
32,83m³/s
Mean elev.
296m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
7 dept-equivalent regions (GADM L2)
- 506.1 km²72.4% of basin
- 148.3 km²21.2% of basin
- 20.5 km²2.9% of basin
- 13.0 km²1.9% of basin
- 9.3 km²1.3% of basin
- 1.9 km²0.3% of basin
- 0.0 km²0.0% of basin
15 intersecting protected areas
Folldalen og Lonskogen
IUCN IaNature Reserve
13.05 km² overlap
Almdalen-Ekorndalen
IUCN IaNature Reserve
6.82 km² overlap
Råbesdalen
IUCN IaNature Reserve
4.46 km² overlap
Flakkan
IUCN Not ReportedEmerald Network
1.48 km² overlap
Flakkan
IUCN IVWildlife Conservation Area
0.92 km² overlap
Flakkan
IUCN IaNature Reserve
0.56 km² overlap
Flenga
IUCN IaNature Reserve
0.36 km² overlap
Øie
IUCN IaNature Reserve
0.33 km² overlap
Storskogan
IUCN IaNature Reserve
0.29 km² overlap
6 more protected areassorted by overlap area
Hattmoenget
IUCN Not ReportedEmerald Network
0.24 km² overlap
Hattmoenget
IUCN IaNature Reserve
0.24 km² overlap
Mjøsund
IUCN IaNature Reserve
0.19 km² overlap
Harestranda
IUCN IaNature Reserve
0.15 km² overlap
Harestranda
IUCN Not ReportedEmerald Network
0.15 km² overlap
Sandtjønnhaugen
IUCN IaNature Reserve
0.11 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 532 distinct species · 22 383 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 34 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 Folldalselva : 25 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 105 interactions GloBI sur 4 types (connectance 17.6%, 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°
3,7°C
Annual rain
1 555mm
Moisture idx (CMI)
0,72
Runoff
1 409mm/an
PET
427mm
AET
421mm
Mean slope
10,0°
Water table
315cm
Forest
48%
Crops
0%
Urban
0%
Protected
2%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)