Doab

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 and Uttarakhand state in India, 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.