This shallow drinking water reservoir was built in the 1960s over the former peatland of Cors y Bol and now constitutes Angelsey's largest lake, supporting  various waterfowl. The draw-down zone around the perimeter supports a number of interesting plants including needle spike rush and pillwort. There is a  visitor centre at the western end near the dam from where a recreational trout fishery operates. There was formerly a common tern colony at the eastern end of the lake..
Anglesey map

SSSI Citation

Site Management Statement

Potentially Damaging Operations list

Verical aerial photograph

Map reproduced by permission of Ordnance Survey ® on behalf of the Controller of Her Majesty's Stationery Office. © Crown copyright. All rights reserved. License number 100044910.