Varṣa-Parvata-Nivāsinām Varnanam
Description of Regions, Mountains, and Their Inhabitants
चित्रोपलां चित्ररथां मज्जुलां वाहिनीं तथा । मन्दाकिनीं वैतरणीं कोषां चापि महानदीम्
citropalāṁ citrarathāṁ majjulāṁ vāhinīṁ tathā | mandākinīṁ vaitaraṇīṁ koṣāṁ cāpi mahānadīm ||
Sañjaya said: “(I beheld) the divisions named Citropalā, Citrarathā, Majjulā, and likewise Vāhinī; also Mandākinī, Vaitaraṇī, Koṣā, and the great river Mahānadī.” In the war narrative, these are proper names of troop-formations or divisions, evoking the imagery of rivers and wondrous places to convey the vastness and ordered arrangement of the host.
संजय उवाच
The verse primarily serves descriptive epic narration rather than direct moral instruction: it emphasizes the immense scale and disciplined organization of the armies by listing named divisions, using river-like names to suggest unstoppable flow and the gravity of the coming conflict.
Sañjaya is reporting to Dhṛtarāṣṭra the arrangement or presence of various named troop-divisions/formations in the battlefield context of Bhīṣma Parva, continuing a catalogue-like description of the forces.