Jaiminīya (Talavakāra) Brāhmaṇa 41.238

Then there was a noble-fellow whose washing-trough it was; he tied it under the axle. The two desired: 'May this ford be shallow for us.' Viśvāmitra saw this sāman. With it he praised: 'The breaker of strongholds, young, wise, of unmeasured might was born, Indra, the upholder of every deed, wielder of the vajra, much praised. You opened the cave of cattle-rich Vala, O wielder of the stone; the gods, being impelled, entered into you without fear. With your gifts, O hero, I have returned, addressing the Sindhu'—speaking thus, the two returned. 'They approached [you], O you who delight in songs; your poets know that'—thus indeed the waters subsided. For the two there was a ford. They crossed over by the ford. Now, where this washing-trough was, right there the waters cut him off. [They said:] 'This one has perished (anaśat)'—these are the Naṃśus. 'The yoke was not raised (yogaḥ na udyataḥ)'—these are the Āyogavas. 'Let us dwell (vasāma) right here today'—these are the Vasātis.

And the young maidens abandoned [their toys] while playing.

That became the Maiden's Mountain.

Now indeed, these forests and these rivers were formerly on the further bank of the Sindhu.

The two, having gone around from behind, obstructed them [from flowing] eastward.

Then whatever was foul-smelling, those became these salt tracts.

And those that stood still, they became these small trees.

[...] and the rivers which they caused to cross, those—