Periyathalai (பெரியதாழை) is a coastal hamlet located in the southern side of Tuticorin district in Tamil Nadu, India. It is about 53 km from Tirunelveli city. The taluk headquarters, Sattankulam, is 14 km north of Periyathalai. In 2008, the district administration has announced that a state-of-the-art fish landing centre would be established on a 10-acre (40,000 m2) area.