North Sentinel Island is the only uncontacted island on all of planet Earth and is roughly inhabited by 15-500 residents.
However, taking an accurate measurement is almost impossible as its inhabitants are extremely hostile to anyone that visits the island. There are also tigers seen on the island.
For example in 1867 an Indian merchant ship wrecked on the island's reef before being attacked by the habitants with bow and arrows and survived by returning sticks and rock found on the beach. They were then rescued by a British boat a week later. The captain describe the habitants to be:
The only friendly meeting with the tribe so far was in 1975 whom they took lots foods from.
"The savages were perfectly naked, with short air and red painted noses, and were opening their mouth and making sounds like pa on tough; their arrows appeared to be tipped with iron." They were 165m short with muscular builds as hunters.
The Sentinelese can build canoes and don't engage in agriculture and live in temporary huts, use metals, and speak an untold language.
The island is located in the Bay of Bengal between India and Thailand.
The island measures 6km wide and 8 km long