Ruisseau· 12 segments
Sagån
Crosses 4 administrative regions : Enköping, Heby, Sala, Västerås
Total length
65km
Max discharge
6,9m³/s
Max Strahler
3
Segments matched
12
River geography4 admin regions · 0 communes
4 administrative regions crossed (GADM L2)
21 intersecting protected areas
Färnebofjärden
IUCN IaWetland of International Importance (Ramsar Site)
Ölstabrändan
IUCN Not ReportedSpecial Protection Area (Birds Directive)
Ölstabrändan
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
Ölstabrändan
IUCN IaNatura 2000 SPA
Ölstabrändan
IUCN IaNatura 2000 SCI
2020645 Ölstabrändan
IUCN IaNature Reserve
2049781 Katrinelund
IUCN IaNature Reserve
2002594 Bispebo
IUCN IaNature Reserve
2050979 Härsta
IUCN IaNature Reserve
12 more protected areassorted by area
2045493 Tärna
IUCN IaNature Reserve
SK 418-2000
IUCN IaHabitat Protection Area
SK 1-2016
IUCN IVNature conservation agreement, Swedish Forest Agency
SK 307-2018
IUCN IVNature conservation agreement, Swedish Forest Agency
SK 71-2006
IUCN IaHabitat Protection Area
SK 210-2000
IUCN IaHabitat Protection Area
SK 229-2001
IUCN IaHabitat Protection Area
SK 137-2014
IUCN IVNature conservation agreement, Swedish Forest Agency
SK 457-2016
IUCN IVNature conservation agreement, Swedish Forest Agency
SK 721-2002
IUCN IaHabitat Protection Area
SK 304-2018
IUCN IVNature conservation agreement, Swedish Forest Agency
SK 335-2001
IUCN IVNature conservation agreement, Swedish Forest Agency
1 page = 1 named river (aggregation of 12 HydroRIVERS v10 segments). Spatial join cached after first hit.
Species present
688 distinct species · 6 150 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 Sagån : 22 espèces reliées par 86 interactions GloBI sur 3 types (connectance 17.3%, filtre Serrano α=0.2). 10 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydrology (HydroRIVERS v10)
Total length
65km
Max discharge
6,9m³/s
Max Strahler
3
Segments matched
12
HydroRIVERS v1.0 (Lehner et al. 2019) aggregated by name + main_riv → 1 entity = 1 named river.