Tags: Site Of Special Scientific Interest.
Glannau Rhoscolyn is a Site of Special Scientific Interest (or SSSI) in Anglesey North Wales and extends along the west coast of Holy Island Anglesey for approximately 6.5 km (from Porthygaran to Silver Bay). It has been designated as a Site of Special Scientific Interest since January 1961 in an attempt to protect its fragile biological and geological elements. The site has an area of 145.49 hectares and is managed by Natural Resources Wales.