Tags: Site Of Special Scientific Interest.
Llyn Eiddwen is a lake and site of special scientific interest near Trefenter in Ceredigion Wales. It is the source of the River Aeron.This natural lake provides an environment to preserve rare local water-plant life and seasonal animals. It is owned and managed by the Wildlife Trust of South and West Wales. Surrounded by sheep-grazed common land it is part of a National Nature Reserve.