Importance of Himalayas:
1. The presence of the Himalayas in north prevents southwest monsoon winds and cause rainfall and snowfall. If this mountain is absent, a major part of the Indian sub-continent would have been a hot and dry desert.
2. Himalayas forms a natural boundary for the sub-continent. It is permanently frozen and is a barrier to invasion.
3. The northern plains of India are of great economic and social significance due to other fertile alluvial soils, flat level land, slow moving perennial rivers and a favourable and trade have been developed.
4. Peninsular plateau is rich in mineral and has huge reserves of Iron, Manganese, Copper, Bauxite, Mica, Chromium, Limestone etc.
5. A large number of big and small ports have been developed all along the coastal areas. These ports an important role in the growth of national and international trade.