Dee Estuary/ Aber Dyfrdwy

Site overview: This site is in the north-west of the UK. It is an important area for saltmarsh and mudflats. Several types of fish, including sea and river lampreys, swim through this site.

Designation Status
Last Updated
6 June 2017
MPA Type
Special Area of Conservation
MPA Purpose
areas which have been identified as best representing the range and variety within the European Union of habitats and (non-bird) species listed on Annexes I and II to the Directive


53° 19' 44" North,
3° 10' 53" West

Surface Area

158.17 km2
(61.07 mi.2 )


149.89 km
(93.14 mi.)

Iconic features protected by this site


  • Atlantic salt meadows (Atlantic salt meadows (Glauco-Puccinellietalia maritimae))
  • Estuaries
  • Intertidal mudflats and sandflats (Mudflats and sandflats not covered by seawater at low tide)


  • Sea lamprey (Petromyzon marinus)


  • Glasswort and other annuals colonising mud and sand (Salicornia and other annuals colonising mud and sand)
  • Annual vegetation of drift lines