Cefn Sidan (Welsh for 'silky ridge';[1] also known as Pembrey beach[2]) is a long sandy beach with dunes, which form the outer edge of the Pembrey Burrows between Burry Port and Kidwelly, facing southwestwards over Carmarthen Bay in South Wales. Cefn Sidan beach is backed by dunes, salt marshes, Pembrey Forest and the Pembrey Country Park.