There is the unusually large number of swamps & lakes of great size and value, particularly in the southern & eastern parts of the district. The larger lakes, which hold water all the year round, are the Kundra Samundar near Jhalotar, the lake near Nawabganj, the wide expanse of water near Kantha and the long chain of lakes in pargana Mauranwan. In Tehsil Safipur, the more important tanks are those at Mawai-Bhari and Kursat and the Harial Tal near Mustafabad. In Tehsil Hasanganj, besides the Kundra Samundar at Mawai, there are the Kulli Bani and Jalesar tanks near Ajgain and the chain of lakes called Basaha, which it seems, partakes of certain characteristics of a stream also, travelling a distance of 96 km in the district and eventually leaving it for district Rae Bareli where it is reckoned as a tributary of the river Sai. In the western part of the Tehsil are the Katgari lake near Asiwan and the stretches of water at Amarpur, Sambha, Sheothana, Marenda & Asakhera, but in its northern and eastern parts, there are only small and very shallow tanks which dry up when rainfall is deficient. In Tehsil Unnao there are no important lakes, but a number of very shallow depressions, which get filled up with water during the rains and yield excellent crop of rice.