Located in the Himalayan foothills in western Assam, Manas was originally a game reserve since 1928 and became a Tiger Reserve in 1974, a World Heritage Site in 1985, and a Biosphere Reserve in 1989 then was declared as a National Park in 1990. The park is contiguous with the Buxa Tiger Reserve in West Bengal, and in 2003 it was declared part of the Chirang-Ripu Elephant Reserve which serves as the international corridor for elephant migration between India and Bhutan. Spread over an area of 500 sq. km, the park has extensive grasslands and is famous for its unique scenic beauty. The park harbours more than 20 endangered species.
Considered one of the world's rarest simian species, the golden langur was first spotted in Manas in the mid-20th Century. Other mammals commonly found here are Rhino, Elephant, Tiger, Pygmy hog, Hispid hare, Assamese macaque, Rhesus macaque, Leopard, Swamp deer, Wild pigs etc. The best season to visit is from November to April.