ישעיהו מד:כז פירוש: רש״י ואבן עזרא

Who says to the deep, “Be dry” Who says to Babylon, “Be dry.”

מצולה═צולה (Jon. 2:4) The deep. A figurative expression, signifying Babylon, that was full of men and wealth like the deep of the sea.⁴⁶Which is full of water.

and I will dry up your rivers Since it is situated on rivers, he compares the slaying of its population to the drying up of rivers.