Bhagavatapurana 11.5.39

11.5.39

kvacit kvacin mahā-rāja draviḍeṣu ca bhūriśaḥ /
tāmraparṇī nadī yatra kṛtamālā payasvinī //

39 & 40. In some particular places, O great king, and largely in Dravida countries where the river Tamraparni, Kritamala and Payasvini, the most holy Kaveri, the great western Mahanadi flow: and those men who drink of their waters, O great king, get pure in mind and mostly become devoted to the Almighty Lord Vasudeva.