The Ganga- Brahmaputra basin is made up of the plains of Ganga and Brahmaputra, foothills of the Himalayas and the Sundarbans delta. The area has monsoonal climate with hot summers and cool winters. The plains are most suitable for human occupation as they have fertile lands that are drained by rivers. The density of plains is very high and agriculture is the main occupation of people. Paddy, wheat, maize and sorghum are other major crops that are grown. Sugarcane and jute are prominent cash crops while silk is also cultivated.The region is dotted by many towns and cities. These include Kolkata, Patna. Allahabad, Varanasi and Kanpur. Transportation is well developed due to plain topography. Commercial activities include industries and tourism.