Doab (English: /ˈdoʊɑːb/) is a term used in South Asia[1] for the tract[2][1] of land lying between two confluent rivers. It is similar to an interfluve.[3] In the Oxford Hindi-English Dictionary, R. S. McGregor defines it as from Persian do-āb (دوآب, literally "two [bodies of] water") "a region lying between and reaching to the confluence of two rivers."
^ abdoab or duab, n., OED Online, Oxford University Press, March 2014, retrieved 24 April 2019 Quote: "Originally and chiefly in South Asia: (the name of) a strip or narrow tract of land between two rivers; spec. (with) the area between the rivers Ganges and Jumna in northern India."
^doab or duab, n., OED Online, Oxford University Press, March 2014, retrieved 24 April 2019 Quote: "confluence, land between two rivers, used in India of the tongue of land between the Ganges and Jumna, and of similar tracts in the Punjab, etc., lit. ‘two waters’ "
^Doab., Webster's Third New International Dictionary, Unabridged., 2013, retrieved 24 April 2019 Quote: " a tract of land between two rivers : interfluve"