Wikipedia
Poompugar is a town in the Nagapattinam 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 Ereythrean sea. it is now established by marine archeological research conducted by the National institute of marine archeology, Goa that much of the town was washed away by progressive erosion and floods. submerged wharves and several meter lengths of pier walls have excavated in recent times have corroborated the literary references to Poompugar. It was rebuilt several times after that. Ancient Pottery dating back to the 4th century BCE have been discovered off shore by marine archeologists east of this town.