South India is a linguistic-cultural region of India that comprises the four states of Andhra Pradesh, Karnataka, Kerala and Tamil Nadu and the two Union Territories of Lakshadweep and Pondicherry, whose inhabitants are collectively referred to as South Indians.

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.