Original: 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.
Simplified: South India consists of the four southern Indian states of Andhra Pradesh, Karnataka, Kerala and Tamil Nadu as well as the union territories of Pondicherry and the Lakshadweep archipelago.