Who lives on North Sentinel Island and what makes this tribe so violent. Is this tribe truly the last untouched tribe? North Sentinel Island lies to the west of the other Andaman Islands in the Bay of Bengal. It is a small island with an area of only about 23 square miles (59.7 sq. km.). It is mostly covered by a forest that gives way to a narrow beach that encircles the island. The island is also surrounded by coral reefs and dark blue water rich with fish and other sea life. What makes North S