Tenby is a seaside town and community in the county of Pembrokeshire, Wales. It lies within Carmarthen Bay. Notable features include 3 miles of sandy beaches and the Pembrokeshire Coast Path, the 13th-century medieval town walls, including the Five Arches barbican gatehouse, Tenby Museum and Art Gallery, the 15th-century St. Mary's Church, and the National Trust's Tudor Merchant's House. Boats sail from Tenby's harbour to the offshore monastic Caldey Island.