Chengam is an important market town and a taluk headquarter located in the foothills of the Eastern Ghats within the Tiruvannamalai district of Tamil Nadu, India. It serves as a significant geographic gateway to the Chengam pass, which lies between the Javvadhu hills to the north and the Chennakesava hills to the south.
The town is a center for various industrial activities in the region. Notable facilities include the Sathanur dam hydro-electric project, an Aavin milk processing plant, and the Periya Kolappadi SIDCO estate.