HydroBASINS lev08 watershed · #2080034030
Bassin de Sira
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 12 administrative regions : Bjerkreim, Bykle, Eigersund, Flekkefjord, Forsand +7
Sub-basin area
1 888,9km²
Upstream area
1 888,9km²
Discharge
108,8m³/s
Mean elev.
663m
Administrative coverage
12 dept-equivalent regions (GADM L2)
- 1164.4 km²61.3% of basin
- 266.3 km²14.0% of basin
- 229.7 km²12.1% of basin
- 121.0 km²6.4% of basin
- 58.3 km²3.1% of basin
- 18.3 km²1.0% of basin
- 18.1 km²1.0% of basin
- 7.0 km²0.4% of basin
4 moreFull L2 list
- Kvinesdal6.3 km² · 0.3%
- Eigersund5.1 km² · 0.3%
- Gjesdal4.3 km² · 0.2%
- Hjelmeland0.3 km² · 0.0%
22 intersecting protected areas
Protected Landscape
377.10 km² overlap
Setesdal Vesthei Ryfylkeheiane
IUCN Not ReportedEmerald Network
377.08 km² overlap
Frafjordheiane
IUCN VProtected Landscape
62.15 km² overlap
Frafjordheiane
IUCN Not ReportedEmerald Network
62.15 km² overlap
Øykjeheia
IUCN IaNature Reserve
15.87 km² overlap
Øykjeheia
IUCN Not ReportedEmerald Network
13.10 km² overlap
Førland/Sletthei og Tverrådalen
IUCN Not ReportedEmerald Network
10.78 km² overlap
Førland/Sletthei
IUCN VProtected Landscape
8.37 km² overlap
Einarvatnet
IUCN IaNature Reserve
6.62 km² overlap
13 more protected areassorted by overlap area
Einarvannet
IUCN Not ReportedEmerald Network
3.28 km² overlap
Tverrådalen
IUCN IaNature Reserve
2.42 km² overlap
Flekkefjord
IUCN Not ReportedEmerald Network
2.09 km² overlap
Flekkefjord
IUCN VProtected Landscape
2.09 km² overlap
Sporkland
IUCN IaNature Reserve
1.95 km² overlap
Instestøl
IUCN IaNature Reserve
0.46 km² overlap
Bervamyr
IUCN IaNature Reserve
0.36 km² overlap
Bervamyr
IUCN Not ReportedEmerald Network
0.36 km² overlap
Drangsdalen
IUCN Not ReportedEmerald Network
0.33 km² overlap
Drangsdalen
IUCN IaNature Reserve
0.33 km² overlap
Skåland
IUCN IaNature Reserve
0.07 km² overlap
Steinsbuskardet-Hisdal
IUCN IVWildlife Conservation Area
0.02 km² overlap
Lusaheia
IUCN VProtected Landscape
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
4 280 distinct species · 124 752 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 39 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 Sira : 22 espèces reliées par 105 interactions GloBI sur 6 types (connectance 14.2%, filtre Serrano α=0.2). 17 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°
3,4°C
Annual rain
1 868mm
Moisture idx (CMI)
0,79
Runoff
1 817mm/an
PET
390mm
AET
390mm
Mean slope
10,9°
Water table
438cm
Forest
43%
Crops
0%
Urban
0%
Protected
25%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)