Great Nicobar, also known as, Tokieong Long by the indigenous inhabitants. Great Nicobar is the largest of the Nicobar Islands of India, north of Sumatra. Indira Point, its southernmost tip, is also the southernmost point of India. The island covers 1045 km² but is scantily inhabited, with a population of about 9439, largely being covered by rainforest and is best known for its diverse wildlife.

The majority of the Great Nicobar is designated as biosphere reserve, named as the Great Nicobar Biosphere Reserve and are home to many unique and endemic species of plants and animals including the Nicobar scrubfowl, a Megapodius nicobariensis, a megapode bird, the Edible-nest Swiftlet, the Nicobar Long-tailed Macaque, saltwater crocodile, Giant Leatherback Sea Turtle, Malayan box turtle, Nicobar tree shrew, reticulated python and the giant robber crab. The Great Nicobar was severely affected by the 2004 Indian Ocean earthquake tsunami with many deaths, and was severed off from all outside contact for more than a day. Great Nicobar is still considered as one of the most visited tourist pot.