South India is a cultural region of India that comprises the four Indian states of Andhra Pradesh , Karnataka , Kerala and Tamil Nadu and the Union Territory of Pondicherry , This region includes the entire Indian Peninsula , south of the Vindhya Range . The Narmada and Mahanadi rivers form the northern boundaries of the region, while the Arabian Sea , Indian Ocean and the Bay of Bengal surround the peninsula in the west, south and east respectively.

The southernmost point of the region (and of mainland India), is Kanyakumari . The geography of South India is diverse, encompassing two mountain ranges - the Western Ghats and Eastern Ghats and a plateau heartland. The Tungabhadra , Kaveri , Krishna and Godavari rivers are important non- perennial sources of water