HydroBASINS lev08 watershed · #2080039150
Bassin de Tverrelva - Gaskajohka
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 2 administrative regions : Båtsfjord, Vardø
Sub-basin area
862,5km²
Upstream area
862,5km²
Discharge
7,96m³/s
Mean elev.
182m
Administrative coverage
2 dept-equivalent regions (GADM L2)
- 460.8 km²53.0% of basin
- 392.4 km²45.2% of basin
14 intersecting protected areas
Varangerhalvøya med Persfjorden-Syltefjord
IUCN Not ReportedEmerald Network
667.21 km² overlap
Varangerhalvøya
IUCN IINational Park
428.74 km² overlap
Persfjorden-Syltefjorden
IUCN VProtected Landscape
238.35 km² overlap
Barvikmyran og Blodskytodden
IUCN Not ReportedEmerald Network
24.92 km² overlap
Barvikmyran og Blodskytodden
IUCN IaNature Reserve
24.92 km² overlap
Ytre Syltevika
IUCN IaNature Reserve
7.24 km² overlap
Oksevatnet
IUCN VProtected Landscape
5.42 km² overlap
Komagværstranda
IUCN IaNature Reserve
1.32 km² overlap
Komagværstranda
IUCN Not ReportedEmerald Network
1.32 km² overlap
5 more protected areassorted by overlap area
Sandfjordneset
IUCN Not ReportedEmerald Network
0.56 km² overlap
Sandfjordneset
IUCN IaNature Reserve
0.56 km² overlap
Hornøya og Reinøya
IUCN Not ReportedEmerald Network
0.27 km² overlap
Hornøya og Reinøya
IUCN IaNature Reserve
0.27 km² overlap
Syltefjorddalen
IUCN IaNature Reserve
0.06 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 747 distinct species · 81 324 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 38 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 Tverrelva - Gaskajohka : 29 espèces reliées par 97 interactions GloBI sur 2 types (connectance 11.8%, 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°
0,6°C
Annual rain
567mm
Moisture idx (CMI)
0,52
Runoff
681mm/an
PET
271mm
AET
251mm
Mean slope
9,2°
Water table
306cm
Forest
0%
Crops
0%
Urban
0%
Protected
81%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)