Physical Geography of India: Which is the longest river entirely within India?

The Godavari, stretching approximately 1,465 kilometers from its source in Maharashtra's Trimbakeshwar to its delta in Andhra Pradesh, is the longest river flowing entirely within India. Known as the 'Ganga of the South,' it drains a large portion of peninsular India, flowing through Maharashtra, Telangana, Chhattisgarh, and Andhra Pradesh. The river supports extensive agriculture and is considered sacred in Hindu tradition, with numerous pilgrimage sites along its banks.