COUNTRYSIDE COUNCIL FOR WALES
SITE OF SPECIAL SCIENTIFIC INTEREST: CITATION
ANGLESEY CORS Y FARL
National Grid Reference: SH490779
Area: 15.5 ha
Cors y Farl is one of the nationally important calcareous fens in Anglesey. It is relatively small but probably the most intact example of this habitat in North Wales.
The fen has developed in a basin on the Carboniferous Limestone and its development appears to have been little modified by drainage and associated activities. There is a large stand of swamp vegetation dominated by the great fen-sedge Cladium mariscus in the central part of the mire. On the soligenous margins of the fen a community in which the black bog-rush Schoenus nigricans is characteristically abundant is well developed in places. In other parts of the mire there are vegetation types present in which a variety of other fen sedges and the blunt-flowered rush Juncus subnodulosus are dominant. Cors y Farl is also noted for its rich insect fauna which includes several rare and uncommon species.