The only great river of the district is the Ganga which first touches the district near the village of Purwa Gahir, in pargana Bangarmau and flows south-eastward, separating this district from districts Kanpur and Fatehpur. Generally, it flows from north-west to the south-east, but it makes several sharp bends such as those near Umriya Bhagwantpur, and Rustampur in tehsil Safipur, Rautapur in tehsil Unnao and Ratua Khera and Duli Khera in tehsil Purwa. The Ganga receives the Morahi near Baksar where it flows close to its old high bank. It leaves the district at a short distance from Baksar.