Originating from the Western Ghats at Mahabaleshwar in Maharahstra, river Krishna of South India is pampered by a number of tributaries in the Karnataka area and then crosses on to Andhra Pradesh and at Vijayawada falls into the Bay of Bengal, after a long journey of 1300 kilometers. And the delta of this river is one of the most fertile areas in the whole of the country. It was here that the ancient Satavahanas and the Ikshwakus of yore set up their capitals.

Krishna has larger watershed area than the Godavari and the Kaveri, and its tributaries are a legion – Koyna, Varna, Ghattaprabha, Malaprabha, Bhima, Thungabhadra, Dindi, Musi, Palleru, Munneru etc. The ancient city of Hampi is on the banks of Thungabhadra that originates from Shimoga of Karnataka. Krishna supports a number of dams and irrigation projects among which the most famous is the Nagarjunasagar of Andhra Pradesh. The Thungabhadra Irrigation project is sponsored jointly by the governments of Karnataka and Andhra Pradesh.