Rivière· 14 segments
Oker
Crosses 7 administrative regions : Braunschweig, Celle, Gifhorn, Goslar, Peine +2
Total length
137km
Max discharge
30m³/s
Max Strahler
5
Segments matched
14
River geography7 admin regions · 0 communes
7 administrative regions crossed (GADM L2)
- BraunschweigNiedersachsen · Germany18.3 kmin this dpt
- GifhornNiedersachsen · Germany18.1 kmin this dpt
- WolfenbüttelNiedersachsen · Germany16.5 kmin this dpt
- GoslarNiedersachsen · Germany14.3 kmin this dpt
- CelleNiedersachsen · Germany3.5 kmin this dpt
- PeineNiedersachsen · Germany0.7 kmin this dpt
- SalzgitterNiedersachsen · Germany0.0 kmin this dpt
29 intersecting protected areas
Harz (Landkreis Goslar)
IUCN VLandscape Protection Area
Aller (mit Barnbruch), untere Leine, untere Oker
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
Landscape Protection Area
Allertal bei Celle
IUCN VLandscape Protection Area
Nature Reserve
Harly
IUCN VLandscape Protection Area
Harly, Ecker und Okertal nördlich Vienenburg
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
Okertal
IUCN VLandscape Protection Area
Okeraue bei Volkse
IUCN IVNature Reserve
20 more protected areassorted by area
Okertal bei Vienenburg
IUCN Not ReportedSpecial Protection Area (Birds Directive)
Nature Reserve
Braunschweiger Okeraue
IUCN IVNature Reserve
Landscape Protection Area
Nature Reserve
Nature Reserve
Landscape Protection Area
Okertal südlich Vienenburg
IUCN IVNature Reserve
Okeraue bei Didderse
IUCN IVNature Reserve
Nördliche Okeraue
IUCN VLandscape Protection Area
Sudmerberg
IUCN VLandscape Protection Area
Landscape Protection Area
Okertalaue
IUCN VLandscape Protection Area
Landscape Protection Area
Ehemalige Bahntrasse zwischen Semmenstedt, Mattierzoll und Börßum sowie angrenzende Landschaftsteile
IUCN VLandscape Protection Area
Landscape Protection Area
Thieder Lindenberg
IUCN VLandscape Protection Area
Landscape Protection Area
Parkgebiet Richmond
IUCN VLandscape Protection Area
Wacholderhain Volkse
IUCN VLandscape Protection Area
1 page = 1 named river (aggregation of 14 HydroRIVERS v10 segments). Spatial join cached after first hit.
Species present
1 263 distinct species · 5 274 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 37 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 Oker : 25 espèces reliées par 114 interactions GloBI sur 5 types (connectance 16.2%, filtre Serrano α=0.2). 13 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
137km
Max discharge
30,0m³/s
Max Strahler
5
Segments matched
14
HydroRIVERS v1.0 (Lehner et al. 2019) aggregated by name + main_riv → 1 entity = 1 named river.