Which river is called lifeline of Andhra Pradesh?

Godavari River is the life line of Andhra Pradesh. The Godavari is India's second longest river after the Ganga and third largest in India, drains about 10% of India's total geographical area. Its source is in Trimbakeshwar, Nashik, Maharashtra. It flows east for 1,465 kilometres, draining the states of Maharashtra (48.6%), Telangana (18.8%), Andhra Pradesh (4.5%), Chhattisgarh (10.9%) and Odisha (5.7%). The river ultimately empties into the Bay of Bengal through an extensive network of tributaries.