HydroBASINS lev08 watershed · #2080059260
Bassin de Þjórsá
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 10 administrative regions : Djúpárhreppur, Gaulverjabæjarhreppur, Gnúpverjahreppur, Holta- og Landasveit, Hraungerðishreppur +5
Sub-basin area
1 290,4km²
Upstream area
1 290,4km²
Discharge
1,09m³/s
Mean elev.
121m
Administrative coverage
10 dept-equivalent regions (GADM L2)
- 291.8 km²22.5% of basin
- 221.4 km²17.0% of basin
- 219.5 km²16.9% of basin
- 142.6 km²11.0% of basin
- 129.3 km²10.0% of basin
- 92.7 km²7.1% of basin
- 81.8 km²6.3% of basin
- 80.5 km²6.2% of basin
2 moreFull L2 list
- Hraungerðishreppur15.7 km² · 1.2%
- Ölfushreppur0.1 km² · 0.0%
5 intersecting protected areas
Svæði í Þjórsárdal
IUCN VProtected Landscape/Seascape
52.35 km² overlap
Gjáin
IUCN IIINatural Monument
0.36 km² overlap
Háifoss og Granni
IUCN IIINatural Monument
0.34 km² overlap
Hjálparfoss
IUCN IIINatural Monument
0.17 km² overlap
Viðey í Þjórsá
IUCN IVNatural Monument
0.03 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
965 distinct species · 35 032 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 26 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 Þjórsá : 15 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 66 interactions GloBI sur 4 types (connectance 17.5%, 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°
4,4°C
Annual rain
1 204mm
Moisture idx (CMI)
0,73
Runoff
1 596mm/an
PET
327mm
AET
325mm
Mean slope
3,3°
Water table
0cm
Forest
0%
Crops
0%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)