HydroBASINS lev08 watershed · #2080024340
Bassin de Arlau
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 6 administrative regions across 2 countries : Aabenraa, Dithmarschen, Flensburg, Nordfriesland, Schleswig-Flensburg +1
Sub-basin area
2 054,2km²
Upstream area
2 054,2km²
Discharge
5,63m³/s
Mean elev.
6m
Administrative coverage
6 dept-equivalent regions (GADM L2)
- 1624.6 km²78.7% of basin
- 301.2 km²14.6% of basin
- 17.6 km²0.9% of basin
- 6.5 km²0.3% of basin
- Flensburg2.1 km²0.1% of basin
- 0.1 km²0.0% of basin
30 intersecting protected areas
Waddensea and Hallig Islands of Schleswig-Holstein
IUCN Not ApplicableUNESCO-MAB Biosphere Reserve
402.53 km² overlap
Ramsar-Gebiet S-H Wattenmeer und angrenzende Küstengebiete
IUCN Not ReportedSpecial Protection Area (Birds Directive)
327.30 km² overlap
S-H Wadden sea National Park
IUCN Not ReportedMarine Protected Area (OSPAR)
310.38 km² overlap
Wetland of International Importance (Ramsar Site)
293.42 km² overlap
NTP S-H Wattenmeer und angrenzende Küstengebiete
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
265.31 km² overlap
Schleswig-Holsteinisches Wattenmeer und Halligen
IUCN Not Assignedbiosphere reserve
237.72 km² overlap
Wadden Sea
IUCN Not ApplicableWorld Heritage Site (natural or mixed)
187.37 km² overlap
National Park
171.52 km² overlap
Nordfriesisches Wattenmeer
IUCN IVNature Reserve
168.93 km² overlap
21 more protected areassorted by overlap area
Schleswig-Holsteinisches Wattenmeer und Halligen, Kernzone
IUCN Not Assignedbiosphere reserve - core area
91.21 km² overlap
Landscape Protection Area
85.59 km² overlap
Schleswig-Holsteinisches Wattenmeer und Halligen, Pflegezone
IUCN Not Assignedbiosphere reserve - buffer zone
80.27 km² overlap
Eiderstedt
IUCN Not ReportedSpecial Protection Area (Birds Directive)
67.04 km² overlap
Schleswig-Holsteinisches Wattenmeer und Halligen, Entwicklungszone
IUCN Not Assignedbiosphere reserve - transition area
66.23 km² overlap
Landscape Protection Area
56.39 km² overlap
Beltringharder Koog
IUCN IVNature Reserve
33.78 km² overlap
Küsten- und Dünenlandschaften Amrums
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
20.19 km² overlap
Amrum
IUCN VLandscape Protection Area
19.26 km² overlap
Dünen- und Heidelandschaften Nord-Sylt
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
19.11 km² overlap
Nord-Sylt
IUCN IVNature Reserve
17.45 km² overlap
Nature Reserve
14.19 km² overlap
Landscape Protection Area
13.46 km² overlap
Untereider
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
8.96 km² overlap
Dünenlandschaft Süd-Sylt
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
7.35 km² overlap
Vadehavet
IUCN IaWetland of International Importance (Ramsar Site)
7.20 km² overlap
Vadehavet med Ribe Å, Tved Å og Varde Å vest for Varde
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
7.15 km² overlap
Amrumer Dünen
IUCN IVNature Reserve
7.14 km² overlap
Dünen- und Heidelandschaften Nord- und Mittel-Sylt
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
6.41 km² overlap
Vidåen, Tøndermarsken og Saltvandssøen
IUCN Not ReportedSpecial Protection Area (Birds Directive)
6.33 km² overlap
Tønder Kommune public
IUCN IV§3 protected habitats (all lakes, bogs, streams, heaths and meadows etc.)
6.04 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
6 764 distinct species · 368 596 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 31 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 Arlau : 26 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 59 interactions GloBI sur 3 types (connectance 12.7%, filtre Serrano α=0.2). 5 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°
8,2°C
Annual rain
827mm
Moisture idx (CMI)
0,30
Runoff
570mm/an
PET
580mm
AET
487mm
Mean slope
0,3°
Water table
24cm
Forest
5%
Crops
31%
Urban
3%
Protected
19%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)