The Nicobar Islands are a chain of islands in the eastern Indian Ocean. They are 150 kilometers northwest of Aceh on Sumatra, isolated from Thailand to the east by the Andaman Sea. They are part of India’s Union Territory of Andaman and Nicobar Islands, located 1,300 kilometers southeast of the Indian subcontinent across the Bay of Bengal. The Great Nicobar Island has been designated as a World Network of Biosphere Reserves by UNESCO. The Nicobar Islands rain forests are recognized as a separate terrestrial ecoregion, with several indigenous species. On Great Nicobar, protected areas include Campbell Bay National Park and Galathea National Park.