Tenby is a walled seaside community in Pembrokeshire, Wales, on the western side of Carmarthen Bay. Tenby is a local government area. Remarkable attributes include 2 1/2 miles (4.0 kilometres) of sandy coastlines and also the Pembrokeshire Coast Course, the 13th century middle ages community wall surfaces, consisting of the 5 Arches barbican lodge, Tenby Museum as well as Art Gallery, the 15th century St. Mary's Church, and the National Trust's Tudor Merchant's House. The community is offered by Tenby train station. Boats sail from Tenby's harbour to the overseas reclusive Caldey Island. St Catherine's Island is tidal as well as has a 19th century Palmerston Ft. With its strategic position on the much west coastline of Britain, and also an all-natural sheltered harbour from both the Atlantic Ocean and the Irish Sea, Tenby was an all-natural negotiation point, most likely a hillside ft with the mercantile nature of the negotiation possibly establishing under Hiberno-Norse impact. The earliest referral to a settlement at Tenby remains in "Etmic Dinbych", a poem most likely from the 9th century, preserved in the 14th century Book of Taliesin.