O Dan y Dŵr - Hidden Seascapes of Wales

Careg Hen Sandwaves

"Old Rock" underwater reef off Trearddur Bay, Anglesey

False colour projection of multibeam sonar data (where colours represent different depths), illustrates the depth and physical composition of two square miles of seabed located three miles to the southwest of Trearddur Bay on Anglesey, close to a well-known, very shallow, rocky outcrop and popular dive site known locally as Careg Hen (Old Rock).



(Sand waves on the seabed)

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