Mahabharata 12.52.32

ययौ रथानां पुरतो हि सा चमू;स्तथैव पश्चादतिमात्रसारिणीपुरश्च पश्चाच्च यथा महानदी; पुरर्क्षवन्तं गिरिमेत्य नर्मदा

yayau rathānāṃ purato hi sā camū;stathaiva paścādatimātrasāriṇīpuraśca paścācca yathā mahānadī; purarkṣavantaṃ girimetya narmadā

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