The district is divided into two distinct geographic regions. The Sadar subdivision mostly consists of the alluvial delta formed by the River Mahanadi and its distributaries. The width of the delta stretches to about 60–75 kilometres from the coast. The land is mostly flat and is intersected by numerous channels, active and abandoned, of the Mahanadi system. Few isolated hillocks near Cuttack form the only break in the plain. The land is often waterlogged during the Monsoon and an elaborate system of canals, embankments and weirs is used for both flood control and irrigation. Paddy is the primary crop and is grown throughout the year. The villages are located on an artificial high ground and are usually surrounded by copses of banyan, mango and other large trees. Most villages have one or more tanks called "pokharis" that supply their fresh water needs.