South India is the area encompassing India's states of Andhra Pradesh, Karnataka, Kerala and Tamil Nadu as well as the union territories of Lakshadweep and Pondicherry, occupying 19.31% of area. South India lies in the peninsular Deccan Plateau and is bounded by the Arabian Sea, Indian Ocean and the Bay of Bengal in the west, south and east respectively. The geography of the region is diverse, encompassing two mountain ranges — the Western Ghats and Eastern Ghats and a plateau heartland. Godavari, Krishna, Tungabhadra and Kaveri rivers are important non-perennial sources of water. Inhabitants of South India are referred to as South Indians.