HydroBASINS lev08 watershed · #2080050130
Bassin de Afon Dulas
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 3 administrative regions : Ceredigion, NA, Powys
Sub-basin area
551,4km²
Upstream area
551,4km²
Discharge
26,72m³/s
Mean elev.
273m
Administrative coverage
3 dept-equivalent regions (GADM L2)
- Powys331.8 km²59.9% of basin
- NA204.5 km²36.9% of basin
- Ceredigion17.0 km²3.1% of basin
30 intersecting protected areas
Eryri
IUCN VNational Park
189.98 km² overlap
Berwyn
IUCN Not ReportedEmerald Network
17.64 km² overlap
Berwyn
IUCN IVSite of Special Scientific Interest
17.64 km² overlap
Berwyn a Mynyddoedd de Clwyd/ Berwyn and South Clwyd Mountains
IUCN Not ReportedEmerald Network
16.31 km² overlap
Pumlumon (Plynlimon)
IUCN IVSite of Special Scientific Interest
7.98 km² overlap
Y Berwyn
IUCN IVNational Nature Reserve
3.86 km² overlap
Dyfi
IUCN IVSite of Special Scientific Interest
3.70 km² overlap
Pen Llŷn a`r Sarnau/ Lleyn Peninsula and the Sarnau
IUCN Not ReportedEmerald Network
3.05 km² overlap
Biosffer Dyfi
IUCN Not ApplicableUNESCO-MAB Biosphere Reserve
3.01 km² overlap
21 more protected areassorted by overlap area
Ynys-Hir
IUCN IVNature Reserve
2.51 km² overlap
Dyfi Estuary / Aber Dyfi
IUCN Not ReportedEmerald Network
2.44 km² overlap
Dyfi Estuary / Aber Dyfi
IUCN Not ReportedMarine Protected Area (OSPAR)
2.10 km² overlap
Pencreigiau'R Llan
IUCN IVSite of Special Scientific Interest
2.04 km² overlap
Cors Fochno & Dyfi
IUCN IVWetland of International Importance (Ramsar Site)
1.68 km² overlap
Site of Special Scientific Interest
1.38 km² overlap
Lake Vyrnwy
IUCN IVNature Reserve
1.30 km² overlap
Ceunant Twymyn
IUCN IVSite of Special Scientific Interest
1.07 km² overlap
Afon Dyfi Ger Mallwyd
IUCN IVSite of Special Scientific Interest
0.82 km² overlap
Cwm Llyfnant
IUCN IVSite of Special Scientific Interest
0.77 km² overlap
Dyfi
IUCN IVNational Nature Reserve
0.47 km² overlap
Pen Llyn a`r Sarnau / Lleyn Peninsula and the Sarnau
IUCN Not ReportedMarine Protected Area (OSPAR)
0.44 km² overlap
Cadair Idris
IUCN IVSite of Special Scientific Interest
0.33 km² overlap
Site of Special Scientific Interest
0.26 km² overlap
Ogof Ddu
IUCN IVSite of Special Scientific Interest
0.25 km² overlap
Waun Cwm Calch
IUCN IVSite of Special Scientific Interest
0.24 km² overlap
Site of Special Scientific Interest
0.21 km² overlap
Tyllau Mwn
IUCN IVSite of Special Scientific Interest
0.05 km² overlap
Coed Afon Crewi
IUCN IVSite of Special Scientific Interest
0.05 km² overlap
Dylife Mine
IUCN IVSite of Special Scientific Interest
0.04 km² overlap
Coed Afon Pumryd
IUCN IVSite of Special Scientific Interest
0.04 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
4 499 distinct species · 186 010 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 13 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 Afon Dulas : 7 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 32 interactions GloBI sur 5 types (connectance 41.0%, filtre Serrano α=0.2). 6 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
1 306mm
Moisture idx (CMI)
0,56
Runoff
1 268mm/an
PET
570mm
AET
533mm
Mean slope
12,1°
Water table
445cm
Forest
14%
Crops
5%
Urban
0%
Protected
38%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)