Thammampatti (also called Dharma Nagar) Town Panchayat is a special-grade town with panchayat (local government) status in the Salem District, in the state of Tamil Nadu. Thammampatti is situated between the Pachamalai and the Kolli Hills. The River Swetha flows through this town and joins the River Vasista to form the River Vellar, which empties into the Bay of Bengal at Parangipettai ( Port Novo).