HydroBASINS lev08 watershed · #2080033760
Bassin de Halleelva
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 3 administrative regions : Larvik, Porsgrunn, Skien
Sub-basin area
265,1km²
Upstream area
265,1km²
Discharge
5,92m³/s
Mean elev.
73m
Administrative coverage
3 dept-equivalent regions (GADM L2)
- 136.9 km²51.4% of basin
- 100.2 km²37.6% of basin
- 0.6 km²0.2% of basin
30 intersecting protected areas
Mølen
IUCN Not ReportedEmerald Network
3.18 km² overlap
Mølen
IUCN IVWildlife Conservation Area
3.00 km² overlap
Håøya
IUCN Not ReportedEmerald Network
1.79 km² overlap
Håøya
IUCN IaNature Reserve
1.78 km² overlap
Viersdalen
IUCN IaNature Reserve
1.13 km² overlap
Demningane og Gravtjernåsen
IUCN IaNature Reserve
0.77 km² overlap
Fritzøehus
IUCN Not ReportedEmerald Network
0.59 km² overlap
Fritzøehus
IUCN VProtected Landscape
0.59 km² overlap
Holtsåsen
IUCN IaNature Reserve
0.28 km² overlap
21 more protected areassorted by overlap area
Hanakne
IUCN IaNature Reserve
0.24 km² overlap
Langholmene
IUCN IVWildlife Conservation Area
0.21 km² overlap
Korseikåsen
IUCN IaNature Reserve
0.21 km² overlap
Hummerbakken
IUCN IaNature Reserve
0.14 km² overlap
Nevlungstranda
IUCN IaNature Reserve
0.12 km² overlap
Kinnhalvøya
IUCN IaNature Reserve
0.12 km² overlap
Kinnhalvøya
IUCN Not ReportedEmerald Network
0.12 km² overlap
Elva
IUCN IaNature Reserve
0.10 km² overlap
Geiterøya
IUCN IaNature Reserve
0.10 km² overlap
Hellås
IUCN IaNature Reserve
0.09 km² overlap
Gumserødøya
IUCN IVWildlife Conservation Area
0.09 km² overlap
Sankt Hansåsen
IUCN IaNature Reserve
0.09 km² overlap
Styggås
IUCN IaNature Reserve
0.08 km² overlap
Fugløyrogn
IUCN IaNature Reserve
0.06 km² overlap
Risøya
IUCN IVBotanical Conservation Area
0.04 km² overlap
Ørstvethalvøya
IUCN IVWildlife/Botanical Conservation Area
0.03 km² overlap
Furuholmen
IUCN IaNature Reserve
0.02 km² overlap
Tangendammen
IUCN IVWildlife Conservation Area
0.01 km² overlap
Vestre Skjæret
IUCN IaNature Reserve
0.01 km² overlap
Eggholmane
IUCN IVWildlife Conservation Area
0.00 km² overlap
Låven
IUCN IIINatural Monument
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
9 379 distinct species · 219 407 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 36 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 Halleelva : 28 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 81 interactions GloBI sur 4 types (connectance 12.2%, filtre Serrano α=0.2). 9 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°
6,8°C
Annual rain
753mm
Moisture idx (CMI)
0,34
Runoff
720mm/an
PET
495mm
AET
418mm
Mean slope
5,6°
Water table
277cm
Forest
69%
Crops
16%
Urban
4%
Protected
3%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)