North Sentinel Island, IndiaYou would be surprised to know that people here are still untouched by the modern world; they don't know about mobile phones, or even the internet. In short, they know nothing about the outside world.
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North Sentinel Island is one of the Andaman Islands, an Indian archipelago in the Bay of Bengal which also includes South Sentinel Island. It is home to the Sentinelese, an indigenous people in voluntary isolation who have defended, often by force, their protected isolation from the outside world.
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.