The Kalvarayan hills are situated 150 kms. north west of Chidambaram on the western side of Kallakurichi Taluk. Spread over an area of 600 sq. kms. approximately with the height ranging from 315 mts. to 1190 mts. these hills offer a temperate climate and quiet solititude. There is a botanical garden on the hills. There are two waterfalls here. The area is ideal for trekking. A summer Festival is also held every year in May.