HydroBASINS lev08 watershed · #2080037130
Bassin de Tverråga
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 4 administrative regions : Beiarn, Bodø, Gildeskål, Meløy
Sub-basin area
834,5km²
Upstream area
834,5km²
Discharge
28,61m³/s
Mean elev.
328m
Administrative coverage
4 dept-equivalent regions (GADM L2)
- 579.5 km²69.0% of basin
- 182.5 km²21.7% of basin
- 12.3 km²1.5% of basin
- 0.1 km²0.0% of basin
14 intersecting protected areas
Láhko
IUCN IINational Park
108.47 km² overlap
Langvassdalen-Ruffedalen
IUCN IaNature Reserve
14.53 km² overlap
Bliksvær
IUCN Not ReportedZoological Protection of Species
4.60 km² overlap
Bliksvaer
IUCN IaWetland of International Importance (Ramsar Site)
4.01 km² overlap
Bliksvær
IUCN Not ReportedEmerald Network
4.00 km² overlap
Bliksvær
IUCN IaNature Reserve
4.00 km² overlap
Fugløya
IUCN IaNature Reserve
4.00 km² overlap
Åsen - Kjeldalen
IUCN Not ReportedEmerald Network
1.95 km² overlap
Åsen - Kjeldalen
IUCN IaNature Reserve
1.95 km² overlap
5 more protected areassorted by overlap area
Teksmona
IUCN IaNature Reserve
1.93 km² overlap
Øya/Langholmen
IUCN Not ReportedEmerald Network
1.22 km² overlap
Øya/Langholmen
IUCN IVProtected Landscape
1.22 km² overlap
Støttværet
IUCN Not ReportedEmerald Network
0.87 km² overlap
Støttværet
IUCN IaNature Reserve
0.87 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 665 distinct species · 67 655 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 35 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 Tverråga : 23 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 77 interactions GloBI sur 4 types (connectance 12.2%, filtre Serrano α=0.2). 13 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°
3,2°C
Annual rain
1 548mm
Moisture idx (CMI)
0,76
Runoff
1 959mm/an
PET
366mm
AET
362mm
Mean slope
14,7°
Water table
500cm
Forest
54%
Crops
0%
Urban
0%
Protected
17%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)