Wetland of International Importance (Ramsar Site) · fra
Marais et tourbières des vallées de la Somme et de l’Avre
- Area
- 131 km²
- IUCN cat.
- IV
- Year
- 2017
Overview
- Designation
- Wetland of International Importance (Ramsar Site)
- IUCN category
- IV · Aire d'habitats / espèces
Gestion active pour maintenir habitats / espèces particuliers
- Established
- 2017
- Managing authority
- Full information available from the Ramsar Sites Information Service (RSIS) website - https://rsis.ramsar.org/ris/2322
Source : WDPA (UNEP-WCMC, World Database on Protected Areas).
Species present
2 219 distinct species · 26 384 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 42 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 Marais et tourbières des vallées de la Somme et de l’Avre : 31 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 140 interactions GloBI sur 6 types (connectance 16.3%, filtre Serrano α=0.2). 11 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydrology7 basins · 37 lakes · 31 rivers
Hydrology metrics for this exact territory
Stream length here
171,3km
Lake surface here
8,82km²
Basins crossed
7
Max stream order
5
Max drainage
6 195km²
Discharge in basins
10,7m³/s
Mean precip.
655mm/an
Mean T°
10,1°C
Moisture idx
-0,12
Max snow
8%
Mean runoff
441mm/an
Mean elev. (basins)
85m
Watersheds crossing here
- Bassin de la Somme Canaliséesub-area1 046,1 km²overlap42.78 km²33%
- Bassin de la Somme Rivièresub-area1 803,8 km²overlap42.06 km²32%
- Bassin de Avresub-area1 277 km²overlap19.53 km²15%
- Bassin de la Somme Canaliséesub-area404 km²overlap16.78 km²13%
- Bassin de l'Halluesub-area275,3 km²overlap7.45 km²6%
- Bassin de la Basse Sellesub-area37,8 km²overlap2.51 km²2%
- Bassin de Nièvresub-area265,2 km²overlap0.28 km²0%
Lakes (37, top by area)
- Lac 1338910area0,7 km²avg depth3.8 m
- Lac 1338554area0,7 km²avg depth2.5 m
- Lac 1339008area0,5 km²avg depth3.8 m
- Lac 1339358area0,5 km²avg depth2.6 m
- Lac 1339056area0,5 km²avg depth2.4 m
- Lac 1339009area0,4 km²avg depth3.0 m
- Lac 1338620area0,4 km²avg depth2.1 m
- Lac 1338597area0,3 km²avg depth1.6 m
- Lac 1338850area0,3 km²avg depth3.1 m
28 more lakes
- Lac 1339083area0,3 km²avg depth2.8 m
- Lac 1338962area0,3 km²avg depth2.8 m
- Lac 1339232area0,3 km²avg depth2.5 m
- Lac 1338539area0,2 km²avg depth2.1 m
- Lac 1338534area0,2 km²avg depth1.8 m
- Lac 1338520area0,2 km²avg depth1.5 m
- Lac 1338364area0,2 km²avg depth1.5 m
- Lac 1338714area0,2 km²avg depth1.6 m
- Lac 1339461area0,2 km²avg depth2.2 m
- Lac 1338952area0,2 km²avg depth2.3 m
- Lac 1338564area0,2 km²avg depth1.9 m
- Lac 1339043area0,2 km²avg depth4.7 m
- Lac 1339011area0,2 km²avg depth2.0 m
- Lac 1339306area0,2 km²avg depth1.9 m
- Lac 1338685area0,2 km²avg depth4.0 m
- Lac 1338558area0,2 km²avg depth2.9 m
- Lac 1339019area0,1 km²avg depth3.6 m
- Lac 1338885area0,1 km²avg depth1.5 m
- Lac 1339052area0,1 km²avg depth2.6 m
- Lac 1339038area0,1 km²avg depth1.9 m
- Lac 1338989area0,1 km²avg depth1.3 m
- Lac 1339084area0,1 km²avg depth2.2 m
- Lac 1339060area0,1 km²avg depth4.3 m
- Lac 1339135area0,1 km²avg depth1.8 m
- Lac 1339213area0,1 km²avg depth2.4 m
- Lac 1338967area0,1 km²avg depth2.9 m
- Lac 1339113area0,1 km²avg depth1.7 m
- Lac 1338843area0,1 km²avg depth2.0 m
Rivers / streams (31, ord ≥ 4)
- La Somme Canaliséeord 5len here51.73 km41%total126 km
- La Somme Rivièreord 4len here22.15 km38%total59 km
- La Sommeord 5len here12.97 km34%total38 km
- La Brachesord 4len here9.75 km53%total19 km
- Rivière du Pont Becquetord 4len here8.89 km73%total12 km
- Canal d'Assèchementord 5len here8.35 km71%total12 km
- L'Avreord 4len here7.98 km30%total26 km
- Avreord 4len here6.43 km19%total34 km
- Rivière de Bellifontaineord 5len here6.08 km39%total16 km
- Rivière du Genoiveord 5len here4.61 km100%total5 km
- Canal de la Petite Écluse (Branche Gauche)ord 4len here3.99 km100%total4 km
- La Drucatord 3len here3.76 km22%total17 km
19 more river segmentssorted by Strahler order + length
- Luceord 4len here3.47 km12%total28 km
- La Ferlanceord 5len here2.92 km40%total7 km
- La Cologneord 2len here2.77 km9%total31 km
- Ancreord 4len here2.62 km5%total53 km
- Canal du Nordord 4len here1.98 km32%total6 km
- L'Eauetteord 5len here1.92 km74%total3 km
- Noyeord 3len here1.26 km10%total13 km
- Omignonord 4len here1.07 km8%total14 km
- La Basse Selleord 5len here1.05 km28%total4 km
- Rieu de l'Agrappinord 5len here1.00 km44%total2 km
- La Maillefeuord 1len here0.74 km13%total6 km
- Fossé Hédinord 3len here0.66 km17%total4 km
- Nièvreord 3len here0.61 km2%total31 km
- La Beineord 1len here0.59 km15%total4 km
- La Germaineord 2len here0.50 km5%total9 km
- Le Scardonord 3len here0.42 km1%total32 km
- La Tortilleord 2len here0.40 km3%total14 km
- L'Airainesord 3len here0.38 km5%total7 km
- L'Ingonord 3len here0.22 km1%total32 km
Live spatial overlap (cached after first hit) · HydroBASINS lev08 × HydroLAKES × HydroRIVERS v10
Location
Fond cartographique : OpenFreeMap · © OpenStreetMap contributors · Géométrie : nos sources (GADM/HydroBASINS/HydroLAKES/HydroRIVERS/WDPA)
- Centroid
- 49.90515, 2.51689
- Open in maps
- OpenStreetMap → · Satellite →
Species observed (Phase 2)
Listing species observed within this protected area requires the GBIF v2 partition × WDPA spatial overlay matview. Computing infrastructure pending.