Coedydd Aber National Nature Reserve

Coedydd Aber National Nature Reserve lies tucked away in a steep valley on the northern flanks of the Carneddau mountains, roughly midway between Bangor and Llanfairfechan in Gwynedd, Wales.

Water cascades over a hard shelf of volcanic rock at the far end of the Aber valley, before plummeting 100m to flow swiftly along one of the steepest river channels in Britain.

The nearby village of Abergwyngregyn was an important centre for the Welsh princes in the 13th century, and the valley contains some remains from this period.