HydroBASINS lev08 watershed · #2080031220
Bassin de Annån
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 4 administrative regions : Hudiksvall, Nordanstig, Sundsvall, Ånge
Sub-basin area
2 513,1km²
Upstream area
2 513,1km²
Discharge
3,4m³/s
Mean elev.
147m
Administrative coverage
4 dept-equivalent regions (GADM L2)
- 1370.0 km²54.2% of basin
- 754.3 km²29.8% of basin
- 290.2 km²11.5% of basin
- 30.2 km²1.2% of basin
30 intersecting protected areas
Hornslandet
IUCN IVNature conservation agreement
16.74 km² overlap
Agön-Kråkön
IUCN IbNatura 2000 SCI
10.84 km² overlap
Agön-Kråkön
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
10.84 km² overlap
Agön-Kråkön
IUCN Not ReportedSpecial Protection Area (Birds Directive)
10.84 km² overlap
Agön-Kråkön
IUCN IbNatura 2000 SPA
10.84 km² overlap
2001190 Agön-Kråkön
IUCN IbNature Reserve
10.84 km² overlap
2002919 Brämön
IUCN IbNature Reserve
7.35 km² overlap
Del av Bremön
IUCN IbNatura 2000 SPA
5.63 km² overlap
Del av Bremön
IUCN IbNatura 2000 SCI
5.63 km² overlap
21 more protected areassorted by overlap area
Del av Bremön
IUCN Not ReportedSpecial Protection Area (Birds Directive)
5.63 km² overlap
Del av Bremön
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
5.63 km² overlap
Hornslandet
IUCN IVNature conservation agreement
5.31 km² overlap
2000942 Älvåsen
IUCN IaNature Reserve
4.39 km² overlap
Hölick
IUCN IaNatura 2000 SCI
4.30 km² overlap
Hölick
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
4.30 km² overlap
2000710 Hölick
IUCN IaNature Reserve
4.30 km² overlap
Älvåsen
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
4.29 km² overlap
Älvåsen
IUCN IaNatura 2000 SCI
4.29 km² overlap
Stormyrskogen
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
3.80 km² overlap
Stormyrskogen
IUCN Not ReportedSpecial Protection Area (Birds Directive)
3.80 km² overlap
Stormyrskogen
IUCN IaNatura 2000 SPA
3.80 km² overlap
Stormyrskogen
IUCN IaNatura 2000 SCI
3.80 km² overlap
2000662 Stormyrskogen
IUCN IaNature Reserve
3.80 km² overlap
Njurundakustens Mångfaldspark
IUCN Not ApplicableVoluntary set-aside areas
3.26 km² overlap
Hornslandet
IUCN IVNature conservation agreement
2.96 km² overlap
2013535 Salen
IUCN IaNature Reserve
2.71 km² overlap
2043766 Långören
IUCN IaNature Reserve
2.39 km² overlap
2001179 Bålsön
IUCN VNature Conservation Area
2.37 km² overlap
Nature Reserve
2.17 km² overlap
2047445 Kvarnmyrorna
IUCN IaNature Reserve
2.15 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
8 472 distinct species · 537 565 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 33 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 Annån : 23 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 105 interactions GloBI sur 5 types (connectance 15.8%, filtre Serrano α=0.2). 14 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°
3,2°C
Annual rain
666mm
Moisture idx (CMI)
0,19
Runoff
334mm/an
PET
539mm
AET
422mm
Mean slope
4,0°
Water table
267cm
Forest
93%
Crops
10%
Urban
0%
Protected
2%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)