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Location United Kingdom, Wales
Central coordinates 3o 59.07' West  52o 32.68' North
IBA criteria C6
Area 2,059 ha
Altitude 0 - 15m
Year of IBA assessment 2007

Royal Society for the Protection of Birds

Site description This west coast estuary is of outstanding physiographic interest for its sand-dune complex, extensive tract of actively-growing raised mire and diverse flood-plain habitats. The sand-dune system comprises all stages of dune formation and associated flora. The IBA is important for wintering wildfowl. Anser albifrons are the flavirostris subspecies.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Greater White-fronted Goose Anser albifrons winter  2001-2006  140 individuals  good  C6  Least Concern 

IBA Monitoring

2007 medium near favourable medium
Good - based on reliable and complete / representative data

Human intrusions and disturbance recreational activities likely in short term (within 4 years) some of area/population (10-49%) moderate to rapid deterioration medium
Residential and commercial development commercial and industrial development likely in long term (beyond 4 years) some of area/population (10-49%) moderate to rapid deterioration medium

Anser albifrons Greater White-fronted Goose 140 100 individuals 72 near favourable

Whole area of site (>90%) covered by appropriate conservation designation  A management plan exists but it is out of date or not comprehensive  Some limited conservation initiatives are in place  medium 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Cors Fochno and Dyfi Wetlands of International Importance (Ramsar) 2,492 protected area overlaps with site 1,661  
Dyfi National Nature Reserve 2,263 protected area overlaps with site 1,428  
Dyfi Site of Special Scientific Interest 3,787 protected area contains site 2,059  
Dyfi National Nature Reserve UNESCO-MAB Biosphere Reserve 1,589 protected area overlaps with site 1,589  
Snowdonia National Park 214,200 protected area overlaps with site 542  
Ynys Hir RSPB Reserve 667 protected area overlaps with site 281  


IUCN habitat Habitat detail Extent (% of site)
Grassland Humid grasslands  -
Wetlands (inland) Fens, transition mires and springs; Mud flats and sand flats; Raised bogs; Rivers and streams; Salt marshes; Sand dunes and beaches; Tidal rivers and enclosed tidal waters  -

Land use

Land-use Extent (% of site)
fisheries/aquaculture -

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Dyfi Estuary/Aber Dyfi. Downloaded from on 28/10/2016

To provide new information to update this factsheet or to correct any errors, please email BirdLife