Cefn Sidan, roughly translated from Welsh, means "Satin Sands". This long sandy beach and its dunes form the outer edge of the Pembrey Burrows between Burry Port and Kidwelly, looking southwards over Carmarthen Bay in South Wales.
The sands were treacherous to sailing ships. In fact, Napoleon's niece was among its victims and is buried at St Illtyds Church, Pembrey.
Today Cefn Sidan forms part of the Pembrey Country Park leisure and nature complex.