HydroBASINS lev08 watershed · #2080050140
Bassin de Afon Conwy
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 4 administrative regions : Conwy, Isle of Anglesey, NA
Sub-basin area
3 556,7km²
Upstream area
3 556,7km²
Discharge
1,65m³/s
Mean elev.
189m
Administrative coverage
4 dept-equivalent regions (GADM L2)
- NA2017.0 km²56.5% of basin
- Conwy753.6 km²21.1% of basin
- 684.9 km²19.2% of basin
- NA0.0 km²0.0% of basin
30 intersecting protected areas
Eryri
IUCN VNational Park
1643.40 km² overlap
Ynys Mon/Anglesey
IUCN VArea Of Outstanding Natural Beauty
208.32 km² overlap
Eryri
IUCN IVSite of Special Scientific Interest
204.21 km² overlap
Eryri/ Snowdonia
IUCN Not ReportedEmerald Network
197.42 km² overlap
Llyn
IUCN VArea Of Outstanding Natural Beauty
159.77 km² overlap
Migneint-Arenig-Dduallt
IUCN Not ReportedEmerald Network
104.97 km² overlap
Migneint-Arenig-Dduallt
IUCN Not ReportedEmerald Network
104.97 km² overlap
Migneint-Arenig-Dduallt
IUCN IVSite of Special Scientific Interest
103.98 km² overlap
Carneddau and Glyderau
IUCN VNature Reserve
71.36 km² overlap
21 more protected areassorted by overlap area
Cadair Idris
IUCN IVSite of Special Scientific Interest
54.81 km² overlap
Pen Llŷn a`r Sarnau/ Lleyn Peninsula and the Sarnau
IUCN Not ReportedEmerald Network
54.63 km² overlap
Ysbyty Estate
IUCN VNature Reserve
49.66 km² overlap
Anglesey Terns / Morwenoliaid Ynys Môn
IUCN Not ReportedEmerald Network
44.59 km² overlap
Anglesey Terns / Morwenoliaid Ynys Mon
IUCN Not AssignedMarine Protected Area (OSPAR)
43.92 km² overlap
Pen Llyn a`r Sarnau / Lleyn Peninsula and the Sarnau
IUCN Not ReportedMarine Protected Area (OSPAR)
43.00 km² overlap
Cadair Idris
IUCN Not ReportedEmerald Network
37.85 km² overlap
Rhinog
IUCN IVSite of Special Scientific Interest
32.90 km² overlap
Rhinog
IUCN Not ReportedEmerald Network
31.46 km² overlap
Emerald Network
28.14 km² overlap
Y Fenai a Bae Conwy/ Menai Strait and Conwy Bay
IUCN Not ReportedEmerald Network
22.08 km² overlap
Y Fenai a Bae Conwy / Menai Strait and Conwy Bay
IUCN Not ReportedMarine Protected Area (OSPAR)
21.82 km² overlap
North Anglesey Marine / Gogledd Mon Forol
IUCN Not AssignedMarine Protected Area (OSPAR)
18.63 km² overlap
North Anglesey Marine / Gogledd Môn Forol
IUCN Not ReportedEmerald Network
18.56 km² overlap
Y Twyni o Abermenai i Aberffraw/ Abermenai to Aberffraw Dunes
IUCN Not ReportedEmerald Network
18.05 km² overlap
Site of Special Scientific Interest
17.88 km² overlap
Mynydd Hiraethog
IUCN IVSite of Special Scientific Interest
17.76 km² overlap
Yr Wyddfa
IUCN IVNational Nature Reserve
16.72 km² overlap
West Wales Marine / Gorllewin Cymru Forol
IUCN Not AssignedMarine Protected Area (OSPAR)
13.77 km² overlap
West Wales Marine / Gorllewin Cymru Forol
IUCN Not ReportedEmerald Network
13.74 km² overlap
Malltraeth Marsh/Cors Ddyga
IUCN IVSite of Special Scientific Interest
13.60 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
19 545 distinct species · 2 063 643 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 35 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 Conwy : 26 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 73 interactions GloBI sur 5 types (connectance 12.3%, filtre Serrano α=0.2). 9 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°
8,8°C
Annual rain
1 086mm
Moisture idx (CMI)
0,46
Runoff
1 100mm/an
PET
568mm
AET
508mm
Mean slope
6,9°
Water table
285cm
Forest
17%
Crops
7%
Urban
3%
Protected
60%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)