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The lake itself is a shallow lagoon separated from the open sea by a shingle bank.
The island is connected to the mainland by a causeway and is the site of a well-known pilgrimage held annually in August.
It was the site of an ancient monastery dedicated to Our Lady.
The ruins of the Augustinian Priory are still to be seen, as is the Norman tower, which leans at a greater angle than the tower at Pisa.
The pilgrimage season starts of the 15th August and continues until the 8th September.