Physical, socio-economic and historical factors influence population distribution in India. Climate along with terrain and availability of water largely determines the pattern of the population distribution. North Indian Plains, deltas and Coastal Plains have higher proportion of population than the interior districts of southern and central Indian States, Himalayas, some of the north eastern and the western states. Evolution of settled agriculture and agricultural development, pattern of human settlement, development of transport network, industrialization and urbanization also affect population distribution.