Doab (Urdu: دوآب, Hindi: दोआब, from Persian: دوآب dōāb, from dō, "two" + āb, "water" or "river") is a term used in India and Pakistan for the "tongue," or tract of land lying between two converging, or confluent, rivers. It is similar to an interfluve, In the Oxford Hindi-English Dictionary, R. S. McGregor defines it as "a region lying between and reaching to the confluence of two rivers (esp. that between the Ganges and Jumna)."
In India, "doab" is now largely a historical term applied to pre-1947 India and is seldom used in contemporary Hindi or Indian English.
The Doab, unqualified by the names of any rivers, designates the flat alluvial tract between the Ganges and Yamuna rivers extending from the Sivalik Hills to the two rivers' confluence at Allahabad. The region has an area of about 23,360 square miles (60,500 square km); it is approximately 500 miles (805 km) in length and 60 miles (97 km) in width.
The region of the Doab figures prominently in the history and myths of Vedic period. The British divided the Doab into three administrative districts or zones, viz., Upper Doab (Meerut), Middle Doab (Agra) and Lower Doab (Allahabad). These districts are now divided into several other districts as enumerated below.
Do Ab or Dow Ab or Du Ab or Doab or Dowab or Duab (Persian: دواب), meaning "two rivers", may refer to: