North Sentinel Island – India
North Sentinel Island, which lies between India and Thailand, is inhabited, but by a tribe completely cut off from civilization. They’ve lived like this for thousands of years, rarely coming into contact with outsiders. Almost nothing is known about the Sentinelese, mainly because they’re so hostile.
In November 2018, an American missionary named John Chau tried to convert the tribe to Christianity. But, after many arrow wounds, he was killed and his body was taken away by the locals. Indian law prevents anyone from coming near the island.