Mahabharata 7.20.35

7.20.35

uṣṇīṣaphenavasanāṃ niṣkīrṇāntrasarīsṛpām |
vīrāpahāriṇīmugrāṃ māṃsaśoṇitakardamām || 35 ||

And elephants and steeds constituted its great alligators, and swords formed its fishes. And it was incapable of being easily crossed over. The bones of brave warriors formed its pebbles, and drums and cymbals its tortoises. And shields and armour formed its boats, and the hair of warriors its floating moss and weeds. And arrows constituted its wavelets and bows its current. And the arms of the combatants formed its snakes. And that river of fierce current, running over the field of battle, bore away both the Kurus and the Srinjayas. And the heads of human beings, constituted its stones, and their thighs its fishes. And maces constituted the rafts (by which many sought to cross it). And head-gears formed the forth that covered its surface, and the entrails (of animals) its reptiles. Awful (in mien), it bore away heroes (to the other world). And blood and flesh constituted its mire. And elephants formed its crocodiles, and standards, the trees (on its banks). Thousands of Kshatriyas sank in it. Fierce, clogged (dead) bodies, and having horse-soldiers and elephant-warriors for its sharks, it was extremely difficult to cross it. And that river ran towards the abode of Yama. And it abounded with Rakshasas and dogs and jackals. And it v as haunted by fierce cannibals all around.