A biosphere reserve is an ecosystem with plants and animals of unusual scientific and natural interest. It is a label given by UNESCO. There are 18 bio-reserves in India. Examples: Dihang-Dibang: It is located in Arunachal Pradesh. Rare mammals such as Mishmi takin, red goral, musk deer, red panda, Asiatic black bear etc. can be spotted here. Gulf of Mannar: It lies between the south-eastern tip of India and the west coast of Sri Lanka, in the Coromandel Coast Region. As many as 117 hard coral species have been recorded in the Gulf of Mannar. Sea turtles are frequent visitors to the gulf as are sharks, dugongs, and dolphins. It is rich in marine wealth.