The Brahmaputra Valley is a region situated between hill ranges of the eastern and northeastern Himalayan range.
The valley consists of the western Brahmaputra valley covering the regions of Goalpara and Kamrup; the central Brahmaputra valley region covering Darrang, Nagaon and Sonitpur districts; and, the eastern Brahmaputra valley covering the districts of Lakhimpur, Dibrugarh and Sibsagar. The Teesta river in North Bengal also drains into Brahmaputra river.
The Brahmaputra Valley with its rainforest-like climate contains some of the most productive soils in the world. The Brahmaputra river flows from Assam to West Bengal where it meets the Ganges River to form the world's largest delta and finally flows into the Bay of Bengal in south. 
- Goswami, Homeswar (1985). Population Trends in the Brahmaputra Valley. Mittal Publications. p. 206.
- Das, Bhuban Mohan (1997). The Brahmaputra valley population. p. 156.