Ruisseau· 2 segments
Halleby Å
Crosses 2 administrative regions : Holbæk, Kalundborg
Total length
25km
Max discharge
4,1m³/s
Max Strahler
3
Segments matched
2
River geography2 admin regions · 0 communes
2 administrative regions crossed (GADM L2)
- KalundborgSjælland · Denmark13.4 kmin this dpt
- HolbækSjælland · Denmark0.6 kmin this dpt
11 intersecting protected areas
Kalundborg Kommune private
IUCN Not Assigned§3 protected habitats (all lakes, bogs, streams, heaths and meadows etc.)
Holbæk Kommune private
IUCN Not Assigned§3 protected habitats (all lakes, bogs, streams, heaths and meadows etc.)
Store Åmose, Skarresø og Bregninge Å
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
Åmose, Tissø, Halleby Å og Flasken
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
Kalundborg Kommune public
IUCN IV§3 protected habitats (all lakes, bogs, streams, heaths and meadows etc.)
Tissø, Åmose og Hallenslev Mose
IUCN Not ReportedSpecial Protection Area (Birds Directive)
Store Åmose
IUCN Not ReportedSpecial Protection Area (Birds Directive)
Holbæk Kommune public
IUCN IV§3 protected habitats (all lakes, bogs, streams, heaths and meadows etc.)
Flasken Reersø
IUCN IVProtected by conservation order, excl. Church surroundings
2 more protected areassorted by area
Bjergsted Bakker
IUCN VProtected by conservation order, excl. Church surroundings
Tissø
IUCN IVProtected by conservation order, excl. Church surroundings
1 page = 1 named river (aggregation of 2 HydroRIVERS v10 segments). Spatial join cached after first hit.
Species present
820 distinct species · 18 605 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 28 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 Halleby Å : 19 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 82 interactions GloBI sur 5 types (connectance 15.5%, 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).
Hydrology (HydroRIVERS v10)
Total length
25km
Max discharge
4,1m³/s
Max Strahler
3
Segments matched
2
HydroRIVERS v1.0 (Lehner et al. 2019) aggregated by name + main_riv → 1 entity = 1 named river.