The Ravva offshore block, with great potential for oil, is located in

1. The question asks for the location of the Ravva offshore block, noted for its oil potential. 2. The Ravva oil and gas field is a significant hydrocarbon-producing area located offshore in the Bay of Bengal. 3. It lies within the Krishna Godavari basin (KG basin), off the coast of Andhra Pradesh. 4. The KG basin is one of India's major sedimentary basins with substantial reserves of petroleum and natural gas. 5. The other options are different sedimentary basins in India: Cauvery basin (south-east coast), Mahanadi basin (east coast, north of KG basin), and Palar-Pennar basin (south-east coast, between Cauvery and KG basins).