Arunachal Pradesh is a predominantly mountainous state in the eastern Himalaya. Its relief changes dramatically from high, snow-covered mountain zones along the northern frontier to deeply dissected middle mountains, foothill belts and the plains adjoining Assam in the south. This exceptional variation in altitude, slope and drainage gives the state a distinctive physical geography and strongly influences climate, vegetation, agriculture, settlement and transport. For geographical study, the terrain can be understood as a broad sequence from the highest Himalayan mountains in the north, through the lower Himalayan and sub-Himalayan belts, to the eastern hill systems and the southern plains. Different classifications use slightly different boundaries, but the common idea is a north-to-south transition from very high relief to lower foothills and alluvial lowlands. Location and General Relief Arunachal Pradesh occupies the easternmost Himalayan sector of India. The state is bordered by B...