North Sentinel Island - Geography

Geography

Before the 2004 earthquake, North Sentinel Island had about 72 km² and a roughly square outline. All around the island, behind a narrow beach the ground rose abruptly by 20 m, and then more gradually to 98 m near the middle. Reefs extended around the island to between 800 and 1300 meters from the shore. A forested islet, Constance Island, was located about 600 metres off the southeast coastline, at the edge of the reef.

The 2004 earthquake tilted the tectonic plate under the island, lifting it by 1 to 2 metres. Large tracts of the surrounding coral reefs were exposed and became permanently dry land or shallow lagoons, extending the boundaries of the island all around — by as much as 1 km on the west and south sides — and uniting Constance Island with the main island.

Apart from the narrow original beach and the uplifted reefs, the island is densely covered by forest.

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