Puhar is a town in the Mayiladuthurai district in the southern Indian state of Tamil Nadu. It was once a flourishing ancient port city known as Kaveri poompattinam, which for a while served as the capital of the Early Chola kings in Tamilakam. Puhar is located near the end point of the Kaveri river, aside the sea coast. It is mentioned in the Periplus of the Erythraean Sea.