Rivière· 3 segments

Roer

Crosses 4 administrative regions : Liège, Roerdalen, Roermond, Viersen

rivière

Total length

24km

Max discharge

30,5m³/s

Max Strahler

Segments matched

River geography4 admin regions · 0 communes

Parent watershed

hybas-20803996502355 km²

4 administrative regions crossed (GADM L2)

Roerdalen
Limburg · Netherlands
9.3 km
in this dpt
Liège
Wallonie · Belgium
1.7 km
in this dpt
Viersen
Nordrhein-Westfalen · Germany
1.3 km
in this dpt
Roermond
Limburg · Netherlands
0.2 km
in this dpt

21 intersecting protected areas

NNN-LI
IUCN Not Assigned
Nature Reserves owned by professional nature management organizations
Vogelschutzgebiet 'Schwalm-Nette-Platte mit Grenzwald u. Meinweg'
IUCN Not Reported
Special Protection Area (Birds Directive)
De Meinweg
IUCN II
National Park
Meinweg
IUCN IV
Nature Conservation Act
Meinweg
IUCN Not Reported
Special Protection Area (Birds Directive)
Meinweg
IUCN Not Reported
Special Areas of Conservation (Habitats Directive)
LSG-Elmpter Wald
IUCN V
Landscape Protection Area
Roerdal
IUCN IV
Nature Conservation Act
Roerdal
IUCN Not Reported
Special Areas of Conservation (Habitats Directive)

12 more protected areassorted by area

Vallée de la Gueule en aval de Kelmis
IUCN Not Reported
Special Protection Area (Birds Directive)
Vallée de la Gueule en aval de Kelmis
IUCN Not Reported
Special Areas of Conservation (Habitats Directive)
Vallée de la Gueule en amont de Kelmis
IUCN Not Reported
Special Areas of Conservation (Habitats Directive)
Vallée de la Gueule en amont de Kelmis
IUCN Not Reported
Special Protection Area (Birds Directive)
NSG Luesekamp und Boschbeek
IUCN IV
Nature Reserve
Lüsekamp und Boschbeek
IUCN Not Reported
Special Areas of Conservation (Habitats Directive)
Hohnbachtal
IUCN VI
Forest Reserve (Walloon Region)
Hohnbachtal
IUCN IV
State Nature Reserve (Walloon Region)
Casino (Etang du ) (Weiher)
IUCN IV
Scientific Interest Site (Walloon Region)
Casino (Terril du) ( Weiher)
IUCN IV
Scientific Interest Site (Walloon Region)
Vieille Montagne - Altenberg
IUCN IV
Certified Nature Reserve (Walloon Region)
Koul
IUCN IV
Certified Nature Reserve (Walloon Region)

1 page = 1 named river (aggregation of 3 HydroRIVERS v10 segments). Spatial join cached after first hit.

Species present

4 131 distinct species · 115 871 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).

RègnesAnimalPlanteChampignonBacterie

RelationsPredationParasitismeSymbiosePollinisation

StatutEn dangerVulnérableProtégéeEndémique

RègnesAnimalPlanteChampignonBacterie

RelationsPredationParasitismeSymbiosePollinisation

StatutEn dangerVulnérableProtégéeEndémique

Indicateurs du tissu écologique

Tissu écologique de Roer : 26 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 122 interactions GloBI sur 5 types (connectance 16.5%, filtre Serrano α=0.2). 13 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées

Interactions affichées

122

Connectance

0.165

Patrimoniales

Plus dense que (national)0 %(top 100%)

Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).

Hydrology (HydroRIVERS v10)