HydroBASINS lev08 watershed · #2080254650
Bassin de Otra
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 8 administrative regions : Bygland, Bykle, Evje og Hornnes, Sirdal, Tokke +3
Sub-basin area
1 548,8km²
Upstream area
2 900,9km²
Discharge
99,82m³/s
Mean elev.
724m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Otra404 km²
- Bassin de Otra121 km²
8 dept-equivalent regions (GADM L2)
- 742.4 km²47.7% of basin
- 656.9 km²42.2% of basin
- 86.2 km²5.5% of basin
- 59.5 km²3.8% of basin
- 5.3 km²0.3% of basin
- 5.1 km²0.3% of basin
- 1.2 km²0.1% of basin
- 0.5 km²0.0% of basin
14 intersecting protected areas
Setesdal Vesthei Ryfylkeheiane
IUCN Not ReportedEmerald Network
180.48 km² overlap
Protected Landscape
177.07 km² overlap
Ljosådalen
IUCN IaNature Reserve
38.37 km² overlap
Hisdal
IUCN IaNature Reserve
16.32 km² overlap
Kviteflogi
IUCN IaNature Reserve
6.99 km² overlap
Steinsbuskardet-Hisdal
IUCN IVWildlife Conservation Area
3.39 km² overlap
Botnfjellet
IUCN IaNature Reserve
1.73 km² overlap
Underforlii
IUCN IaNature Reserve
1.55 km² overlap
Heddeviksfjell
IUCN IaNature Reserve
0.59 km² overlap
5 more protected areassorted by overlap area
Staven
IUCN IaNature Reserve
0.55 km² overlap
Skorsfjell
IUCN IaNature Reserve
0.38 km² overlap
Vestedjan
IUCN IaNature Reserve
0.26 km² overlap
Gardefjellet
IUCN IaNature Reserve
0.19 km² overlap
Kyrelitjern
IUCN IaNature Reserve
0.13 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
6 369 distinct species · 86 941 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 46 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 Otra : 35 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 106 interactions GloBI sur 6 types (connectance 9.8%, 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°
2,6°C
Annual rain
1 415mm
Moisture idx (CMI)
0,70
Runoff
1 133mm/an
PET
413mm
AET
408mm
Mean slope
11,2°
Water table
463cm
Forest
64%
Crops
0%
Urban
0%
Protected
14%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)