Sully Island (meaning "south lea" or "south pasture") is a small island a kilometre off the coast of south Wales, between Penarth and Barry. The rate of tidal rise and fall in the area is the second highest in the world: only that of Bay of Fundy, Nova Scotia is greater. A causeway connecting the island to the mainland is uncovered for approximately 3 hours either side of low tide; the island is cut off from the mainland for the rest of the day. This makes Sully Island a dangerous place: many people have been swept to their deaths while trying to leave the island as the tide rises.
Other facts about Sully:
A Saxonfort lies on the island's south-eastern headland. Some people believe that this was a Saxon stronghold, while others believe it was a defended homestead rather than a full settlement.
The waters around Sully Island are fished for species such as cod, whiting, pouting, dogfish and bass.
In the 13th century, the island was the base for "De Marisco", a Normanpirate known as "The night hawk". In later years, it was known for its involvement in the local smuggling trade.
A causeway connecting the island to the mainland is uncovered for approximately 3 hours either side of low tide; the island is cut off from the mainland for the rest of the day.
This makes SullyIsland a dangerous place and many people have been swept to their deaths while trying to leave the island as the tide rises.