A Doab (Persian, Urdu: dō, "two" + āb, "water" or "river") 's a term used in India and Pakistan for a "tongue" or tract of land lying between two confluent rivers. The Doab, Uttar Pradesh, India The Doab, unqualified by the names of any rivers, designates the flat alluvial tract between the Ganges and Yamuna rivers in western and southwestern Uttar Pradesh state in India, extending from the Shiwalik range to the two rivers' confluence at Allahabad. The Doab has an area of about 23,360… (More on Doab)