Before revision: The Doab The Doab , United Provinces, 1908 map The Doab designates the flat alluvial tract between the Ganges and Yamuna rivers extending from the Sivalik Hills to the two rivers' confluence at Prayagraj.
After revision: The Doab The Doab designates the flat alluvial tract between the Ganges and Yamuna rivers extending from the Sivalik Hills to the two rivers' confluence at Prayagraj.