This term in Hindustan means any tract of country included between two rivers. Thus, in the Punjab there are five Doabs lying between the Indus and the Sutlej, and the tributaries of these rivers. The tract of territory, however, usually implied in the general term "the Doab," is that portion of the great political division of India known as the North-Western Provinces, which lies between the Jumna and the Ganges. This vast tract extends from Allahabad in the south to Saharanpur in the north, and is situated between Lat. 25.20 and 30.20. The soil is fertile, and produces millet, sugar cane, and barley, and is peculiarly adapted for indigo, which grows here in a wild state. The opium-poppy and tobacco have also been introduced. The territory contains many thriving and populous towns, and the whole country has been brought into a high state of cultivation by means of a magnificent plan of irrigation, comprising the main line of the Ganges Canal, which flows from Kurdwar through the centre of the Doab, with branches extending to almost every town in the province. The climate during the rainy season is hot, but during the winter is cool. By a treaty concluded with Scindia in 1803, the forts and territories of the Doab between the Jumna and the Ganges were ceded to the British; and the southern part of the Doab was ceded in 1801 by the reigning nabob of Oude. (E.T.)