Doab  Doab () is a term used in South Asia for the 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 from Persian "do-āb" (, literally "two [bodies] of water") "a region lying between and reaching to the confluence of two rivers (esp. that between the Ganges and Yamuna)." "The Doab" designates the flat alluvial tract between the Ganges and Yamuna rivers extending from the Sivalik Hills to the two rivers' confluence at Allahabad. It is also called as "Ganges-Yamuna Doab" or "Ganga Doab". The region has an area of about 23,360 square miles (60,500 square km); it is approximately in length and in width. The British raj divided the "Doab" into three administrative districts, viz., Upper Doab (Meerut), Middle Doab (Agra) and Lower Doab (Allahabad). Currently the following states and districts form part of "The Doab":  Dehradun and Haridwar  Saharanpur, Shamli, Muzaffarnagar, Baghpat, Meerut, Ghaziabad, Hapur, Gautam Buddh Nagar and Bulandshahr   Etah, Kasganj, Aligarh, Agra, Hathras, Firozabad, Farrukhabad, Kannauj, Mainpuri, Etawah, Auraiya and Mathura. Mathura is in the trans-Yamuna region of Braj. Kanpur, Fatehpur, Kaushambi and Allahabad. Each of the tracts of land lying between the confluent rivers of the Punjab region of Pakistan and India has a distinct name, said to have been coined by Raja Todar Mal, a minister of the Mughal emperor Akbar. The names (except for "Sindh Sagar") are a combination of the first letters, in the Persian alphabet, of the names of the rivers that bound the Doab. For example, "Jech" () = Jehlam" (, "Jhelum") + Ch"anāb (, "Chenab"). The names are (from west to east):  The Sindh Sagar Doab lies between the Indus and Jhelum rivers.