Vandaravu peak is the highest peak in the Palani hills. The range lies between the Cumbum Valley on the south, which is drained by the Vaigai River and its upper tributaries, and the Kongunadu region to the north. The northern slopes are drained by the Shanmukha River, Nanganji River, and Kodavanar River, which are tributaries of the Kaveri River. The range lies mostly within Dindigul district, except in the western portion, where it forms the boundary between Dindigul district and Theni district to the south and Idukki District to the south west. The hill station of Kodaikanal lies in the southern central portion of the range. Palani Hills joined with Anamalai Hills and Cardamom Hills at Anamudi peak in Kerala state.