Rathlin Island (răthˈlĭn) [key], 5 sq mi (13 sq km), Moyle dist., N Northern Ireland. Its cliffs, of limestone and basalt, rise at Slieveacarn to 449 ft (137 m). Farming and fishing are important. St. Columba is said to have founded a church there in the 6th cent., and the ruins of a castle in which Robert I (Robert the Bruce) is reputed to have hidden still remain.
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