Tombelaine is a small tidal island off the coast of Normandy in France. It lies a few kilometres north of Mont Saint-Michel. At low tide the island can be reached on foot (with a guide) from the coast of Cotentin, 3.5 km to the north-east, and from Mont Saint-Michel. The island lies just to the south of the course of the Sélune river, which has to be forded to access the island from Cotentin. The island is 250 metres by 150 metres, and 45 metres high. It is composed of granite. It is in the commune of Genêts.
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