HydroBASINS lev08 watershed · #2080397730
Bassin de Swalm
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 : Beesel, Heinsberg, Mönchengladbach, Roerdalen, Roermond +1
Sub-basin area
266,7km²
Upstream area
266,8km²
Discharge
3,46m³/s
Mean elev.
67m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
6 dept-equivalent regions (GADM L2)
- Viersen119.3 km²44.6% of basin
- Heinsberg92.5 km²34.6% of basin
- Mönchengladbach37.5 km²14.0% of basin
- 14.8 km²5.5% of basin
- 2.0 km²0.8% of basin
- 1.5 km²0.6% of basin
30 intersecting protected areas
LSG-Schwalmplatte
IUCN VLandscape Protection Area
33.57 km² overlap
Vogelschutzgebiet 'Schwalm-Nette-Platte mit Grenzwald u. Meinweg'
IUCN Not ReportedSpecial Protection Area (Birds Directive)
27.52 km² overlap
Landscape Protection Area
18.96 km² overlap
LSG-Elmpter Wald
IUCN VLandscape Protection Area
9.05 km² overlap
NSG Brachter Wald
IUCN IVNature Reserve
7.61 km² overlap
NNN-LI
IUCN Not AssignedNature Reserves owned by professional nature management organizations
7.26 km² overlap
Schwalm, Knippertzbach, Raderveekes u. Lüttelforster Bruch
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
7.19 km² overlap
Wälder und Heiden bei Brüggen-Bracht
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
6.95 km² overlap
LSG-Grenzwald
IUCN VLandscape Protection Area
5.04 km² overlap
21 more protected areassorted by overlap area
LSG-Hardter Wald
IUCN VLandscape Protection Area
4.69 km² overlap
Landscape Protection Area
4.06 km² overlap
Nature Reserve
3.93 km² overlap
LSG-Schwalmniederung
IUCN VLandscape Protection Area
3.49 km² overlap
LSG-Meinweg
IUCN VLandscape Protection Area
3.49 km² overlap
LSG-Meinweg
IUCN VLandscape Protection Area
3.15 km² overlap
NSG Elmpter Schwalmbruch
IUCN IVNature Reserve
2.96 km² overlap
Elmpter Schwalmbruch
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
2.86 km² overlap
LSG-Muehlenbachtal
IUCN VLandscape Protection Area
2.39 km² overlap
Tantelbruch mit Elmpter Bachtal und Teilen der Schwalmaue
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
2.36 km² overlap
Landscape Protection Area
2.35 km² overlap
Landscape Protection Area
2.09 km² overlap
LSG-Schwalmtal
IUCN VLandscape Protection Area
2.05 km² overlap
Nature Reserve
1.93 km² overlap
NSG Meinweg
IUCN IVNature Reserve
1.68 km² overlap
LSG-Meinweg
IUCN VLandscape Protection Area
1.54 km² overlap
NSG Tantelbruch
IUCN IVNature Reserve
1.36 km² overlap
LSG-Viehstrasse
IUCN VLandscape Protection Area
1.30 km² overlap
NSG Tueschenbroicher Wald
IUCN IVNature Reserve
1.08 km² overlap
Swalmdal
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.03 km² overlap
Swalmdal
IUCN IVNature Conservation Act
1.03 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
5 339 distinct species · 213 793 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 38 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 Swalm : 31 espèces + 7 bulles famille, 75 interactions GloBI documentées sur 5 types (connectance 10.7%, filtre Serrano α=0.2). Les 7 bulles regroupent des espèces visuellement absorbées par famille (≥3 espèces visibles).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
10,0°C
Annual rain
795mm
Moisture idx (CMI)
0,07
Runoff
401mm/an
PET
738mm
AET
578mm
Mean slope
0,8°
Water table
45cm
Forest
15%
Crops
33%
Urban
43%
Protected
48%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)