HydroBASINS lev08 watershed · #2080034120
Bassin de Ognaelva
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 17 administrative regions : Bjerkreim, Eigersund, Finnøy, Forsand, Gjesdal +12
Sub-basin area
2 882,5km²
Upstream area
2 882,5km²
Discharge
2,42m³/s
Mean elev.
324m
Administrative coverage
17 dept-equivalent regions (GADM L2)
- 644.7 km²22.2% of basin
- 497.5 km²17.2% of basin
- 302.3 km²10.4% of basin
- 276.8 km²9.6% of basin
- 228.8 km²7.9% of basin
- 175.9 km²6.1% of basin
- 129.4 km²4.5% of basin
- 87.9 km²3.0% of basin
30 intersecting protected areas
Frafjordheiane
IUCN Not ReportedEmerald Network
349.21 km² overlap
Frafjordheiane
IUCN VProtected Landscape
347.97 km² overlap
Jærstrendene
IUCN Not ReportedEmerald Network
38.73 km² overlap
Setesdal Vesthei Ryfylkeheiane
IUCN Not ReportedEmerald Network
37.88 km² overlap
Protected Landscape
37.88 km² overlap
Jærstrendene
IUCN VProtected Landscape
29.05 km² overlap
Jaeren wetland system
IUCN IaWetland of International Importance (Ramsar Site)
23.72 km² overlap
Jærstrendene
IUCN IVWildlife Conservation Area
16.16 km² overlap
Synesvarden
IUCN Not ReportedEmerald Network
15.13 km² overlap
21 more protected areassorted by overlap area
Synesvarden
IUCN IVProtected Landscape
12.52 km² overlap
Hesten
IUCN IaNature Reserve
11.32 km² overlap
Rott-Håstein-Kjør
IUCN IaWetland of International Importance (Ramsar Site)
9.88 km² overlap
Orrevatnet
IUCN Not ReportedEmerald Network
9.42 km² overlap
Orrevatnet
IUCN IaNature Reserve
9.42 km² overlap
Longavatnet
IUCN IaNature Reserve
8.18 km² overlap
Longavatnet
IUCN Not ReportedEmerald Network
8.18 km² overlap
Gitlandsåsen
IUCN Not ReportedEmerald Network
7.13 km² overlap
Skurvedalen
IUCN IaNature Reserve
5.63 km² overlap
Heglane og Eime
IUCN Not ReportedZoological Protection of Species
4.45 km² overlap
Jærstrendene
IUCN IVBotanical Conservation Area
2.72 km² overlap
Nordre Rennesøy
IUCN IVWildlife Conservation Area
2.67 km² overlap
Synesvarden
IUCN VProtected Landscape
2.61 km² overlap
Vignesholmane
IUCN Not ReportedEmerald Network
2.22 km² overlap
Urådalen og Sæland
IUCN Not ReportedEmerald Network
2.15 km² overlap
Vignesholmane
IUCN IVWildlife Conservation Area
2.06 km² overlap
Urådalen
IUCN VProtected Landscape
1.94 km² overlap
Foreknuten
IUCN IaNature Reserve
1.92 km² overlap
Kjørholmane
IUCN IaNature Reserve
1.85 km² overlap
Grudevatn
IUCN Not ReportedEmerald Network
1.84 km² overlap
Jærkysten
IUCN Not ReportedMarine Protected Area
1.32 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
13 212 distinct species · 2 338 610 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 30 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 Ognaelva : 22 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 73 interactions GloBI sur 4 types (connectance 16.8%, filtre Serrano α=0.2). 8 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°
5,5°C
Annual rain
1 716mm
Moisture idx (CMI)
0,76
Runoff
1 713mm/an
PET
402mm
AET
400mm
Mean slope
9,6°
Water table
392cm
Forest
41%
Crops
11%
Urban
6%
Protected
17%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)