Doors are one of the few places left in the country where nature is so grand with its green facilities, and its dispersion of virgin forests has been cut by river Teesta and its numerous tributaries. This area is about 30 km wide and stretches up to 350 km from the Teesta river in West Bengal to the river Dhanushuri of Assam. Door means 'ars Dooars' in Assamese, Bengali, Maithili, Bhojpuri, Magahi and Telugu languages too. It has 18 pathways or gateway between Bhutan hills and India's plains. This area is divided into Eastern and Western Couparas by the river, which covers an area of 8800 sq km.