The Ganga, Kalyani and Sai are the main rivers of the district, the former making its western and southern boundaries and the latter, for the greater part of its course, forming its northern & eastern boundaries. Among the other mainstreams of the district are Kalyani, the Tanai, the Loni and the Morahi (Naurahi), all tributaries of the Ganga. These rivers generally run dry during the hot weather, but hold water during the greater part of the year and are utilized for irrigation.