Demographics. North Sentinel Island is inhabited by the Sentinelese, indigenous people who defend their voluntary isolation by force. Their population was estimated to be between 50 and 400 people in a 2012 report.
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The Sentinelese are an uncontacted tribe living on North Sentinel Island, one of the Andaman Islands in the Indian Ocean. They vigorously reject all contact with outsiders. Survival International lobbies, protests and uses public pressure to ensure their wish to remain uncontacted is respected.
The Andaman and Nicobar Islands Protection of Aboriginal Tribes Act of 1956 prohibits travel to the island, and any approach closer than 5 nautical miles (9.3 km), in order to protect the remaining tribal community from mainland infectious diseases against which they (likely) have no acquired immunity.
There are two active volcanoes on the Heard Island, and it is completely barren. The entire island is composed of debris and limestone that took place as a result of volcanic eruptions. To preserve the fragile natural surroundings, the Australian Government restricted entry to the forbidden island.
The Falkland Islands in the South Atlantic feature a number of private islands, typically run as sheep raising family farms and tourist destinations. Prominent among these is Weddell Island, one of the largest private islands in the world, with a surface area of 265.8 km2 (102.6 sq mi).
Both tourists and Brazilian locals are forbidden from visiting Ilha de Queimada Grande. The island is so dangerous that the only people who have ever been permitted to visit are the Brazilian Navy, who stops by once a year to maintain the island's lighthouse, and groups of biologists who study the snakes.
Tristan da Cunha is a British Overseas Territory with its own constitution. There is no airstrip on the main island; the only way of travelling in and out of Tristan is by boat, a six-day trip from South Africa.