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Photo: Richard Knights, CC BY-SA 2.0 via Wikimedia Commons
At low water (when the tide is out) walk over to Sully Island, a small tidal island at the hamlet of Swanbridge, Vale of Glamorgan, four hundred and fifty metres off the coast. On the foreshore facing the mainland you can see the wreck of a wooden ship at low tide.
Sully Island is a small tidal island of 14.5 acres (5.9 ha) by the hamlet of Swanbridge in the Vale of Glamorgan, Wales. It is located 400 m (440 yd) off the northern coast of the Bristol Channel, midway between the towns of Penarth and Barry and 10 km (6 mi) south of the Welsh capital city of Cardiff. It is part of the parish of Sully, after which it is named, and is registered as a Site of Special Scientific Interest. Sully island is one of 43 unbridged tidal islands that can be reached on foot from the mainland of Great Britain.
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The eastern end of the island features remains of a Saxon fort with a Bronze Age barrow at the highest point.