Valley Lakes is an RSPB Reserve and a Site of Special Scientific Interest (SSSI) which has been designated for its diverse aquatic plants and rich bird life. It is located near to the village of Llanfihangel yn Nhywyn, and is an attractive landscape, with sparkling, blue lakes punctuated by gorse-covered rocky outcrops and distant views of Holyhead Mountain to the north west. The reserve is made up of a collection of lakes; Llyn Penrhyn, Llyn Dinam, Llyn Treflesg and Llyn Cerrig Bach. Llyn Dinam is a Special Area of Conservation (SAC), and Llyn Cerrig Bach, as well as being noteworthy for its wildlife, is renowned as the find location of Wales’ most important Iron Age treasure hoard. The nearby reservoir Llyn Traffwll, whilst not forming part of the RSPB reserve, is a SSSI for its plant species and overwintering wildfowl. The lakes collectively support a broad assemblage of birds, including ducks and grebes and wintering coot, teal, wigeon, gadwall and goldeneye. The reserve is one of the last places in Wales where bittern bred, in 1984.
In spring and early summer the reedbeds come alive with reed and sedge warblers, reed bunting, Cetti’s warbler, and water rail. You might be lucky to catch a glimpse of other resident birds like tufted duck and shoveler.
The reserve car park is located off the main road to RAF Valley.