Isaiah 19:6

And the streams shall fail, and the canals of the river; and every reservoir of water shall be dried up, in every marsh also of reed and papyrus.

And they shall turn the rivers far away; and the brooks of defence shall be emptied and dried up: the reeds and flags shall wither.

The rivers will become foul. The streams of Egypt will be diminished and dried up. The reeds and flags will wither away.