The Andaman and Nicobar Islands are a string of 572 islands that run roughly north-south in the Bay of Bengal between Myanmar and Indonesia, but are formally a part of the Republic of India. Of the hundreds of islands, less than 40 are inhabited. While you can travel and visit some of the islands, but as of 2005, there are also a few that India has declared closed to outsiders to preserve these distinct cultures, living much as they have for hundreds to thousands of years, remaining distant from all outsiders. The most extreme example are the Sentinelese people who live on North Sentinel Island (Google maps). [more inside]
"The last speaker of an ancient language in India's Andaman Islands has died at the age of about 85." Boa Sr was the last person to speak the Bo language (or Aka-Bo), a part of the Great Andamanese language family, which is nearly extinct. For more on Andamanese languages here is Niclas Burenhult's paper Deep Linguistic Prehistory, with particular reference to Andamanese and Anvita Abbi's phenomenal Vanishing Voices of the Great Andamanese. Both Vanishing Voices and the BBC report have recordings of the Bo language.