Nicobar Islands
Unlike the Andamans, the Nicobar Islands are untouched and pristine. UNESCO has declared the islands as one of the world network of biosphere reserves. The forests are lush and the beaches are surreal beyond explanation.
Visiting certain areas of the islands is possible if you are granted permission by the local authorities, but the tribal belts are completely out of bounds unless for research purposes, and even for that one will have to go through rigorous formalities.
While the Andaman Islands are a place of immense tourism, the Nicobar Islands lie shrouded in mystery and fascination to the Indian population.