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 from the coast of Cotentin, 3.5 kilometres to the northeast, 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 m by 150 m , and 45 m high. It is composed of granite. It is in the commune of Genêts.
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