Assumption Island is a small island located at 9°45′S 46°29′E in the Indian Ocean north of Madagascar and is part of the country of the Seychelles. It is a single coral island which measures 11.07 km² in area and which has a small settlement on the sheltered western side. Two large sand dunes are prominent on the southeastern coast of the island, one of them 32 m high. There is a concrete runway that runs from between the two sand dunes on the southeast to the settlement.
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A notable feature of this island is the Assumption Island day gecko. A subspecies of geckos found only on this island.