Mahabharata 3.212.23

तमसा नर्मदा चैव नदी गोदावरी तथावेण्णा प्रवेणी भीमा च मेद्रथा चैव भारत

tamasā narmadā caiva nadī godāvarī tathāveṇṇā praveṇī bhīmā ca medrathā caiva bhārata

Our plain-language meaning of this verse is waiting for scholar review.