Bhagavatapurana 11.5.40

11.5.40

kāverī ca mahā-puṇyā pratīcī ca mahā-nadī /
ye pibanti jalaṃ tāsāṃ manujā manujeśvara /
prāyo bhaktā bhagavati vāsudeve 'malāśayāḥ //

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.