Uncontacted tribe and strange geography

 Just read this article:

http://www.dailymail.co.uk/travel/travel_news/article-3049022/The-island-dangerous-visit-Mysterious-Sentinelese-tribe-rejected-outsiders-60-000-years-try-kill-sets-foot-land.html?ITO=1490&ns_mchannel=rss&ns_campaign=1490

It is on an uncontacted tribe in the Indian ocean, more precisely in the Bay of Bengal.  They are hostile to the outside world and the Indian goverment stopped trying to contact them.  The island is called North Sentinel.  It is part of the Andaman Islands.  They aren't well known.

Beside their mysterious culture, what I found a bit strange is at the geographical place the island is.  Looking at the map, I find the island is closer to Burma than India.  I wonder why it is so. It isn't explaned in the article.  In there, they aren't going deeper in the history of the area.  It could explain why the island's resident are so agressive when it come to the outside.  Maybe there would be clues in the past.  I wonder if the explorer took many notes when they explored this area.  Maybe there could be an explanation by just looking for journals or other written pieces.

I knew about the place before reading this article.  I think it isn't the first article on that subject.  I remember reading something similar in the past but I don't remember where I read it.  I know that tribes are often oncovered elsewhere.  Would be nice to have a place where this kind of news would be assembled.  I would like to know where discovering new tribes are taking place.  I know the Amazon bassin is one of those place.  Don't know if it is happening elsewhere.  For the Sentinel island, they deserve the title of the tribe that reject contact on a constant basis.  There must be something that would explain their attitude.  I just would like to know why.