Needamangalam formerly Yamunambalpuram, is a municipality town in Thiruvarur district in the Cauvery Delta of Indian state of Tamil Nadu. Needamangalam was originally part of composite Tanjore District (Madras Presidency) during British Raj until 1997 AD. In the 18th and 19th century, it was also called Yamunambapuram (see section on Santhana Ramaswamy Temple below). Needamangalam is the headquarters of the Needamangalam Taluk. The town is located 20 km east of Thanjavur, 80 km east of Tiruchirappalli and 318 km south of Chennai.