Cors Goch National Nature Reserve is a wetland in a shallow valley near the village of Llanbedrgoch, on the eastern side of Anglesey.
Shimmering reeds edge stretches of open water including Llyn Cadarn. A host of rare plants and animals are able to flourish in this environment, including great crested newts and adders. The medicinal leech and glow worm have also been found here.