Craig yr Aderyn, also known as Bird's Rock, is a hill rising to a height of 258 metres (846 ft) above sea level on the south bank of the River Dysynni near Llanfihangel-y-Pennant in the county of Gwynedd, north-west Wales. Picture taken from the ruins of Castell y Bere, built by the Princes of Gwynedd in the 13th century. [Wikipedia].