CC Madhya 9.218
pāṇḍya-deśe tāmraparṇī gelā gaurahari
Śrī Caitanya Mahāprabhu passed that night in the house of the brāhmaṇa. Then, after showing him mercy, the Lord started toward the Tāmraparṇī River in Pāṇḍya-deśa.
Pāṇḍya-deśa is situated in the southern part of India known as Kerala and Cola. In all these areas there were many kings with the title Pāṇḍya who ruled over Madurai and Rāmeśvara. In the Rāmāyaṇa the Tāmraparṇī River is mentioned. The Tāmraparṇī, also known as the Puruṇai, flows through Tirunelveli before entering the Bay of Bengal. The Tāmraparṇī River is also mentioned in Śrīmad-Bhāgavatam (11.5.39).