John Gill Commentary Isaiah 51:10

"Is it not thou that driedst up the sea, the waters of the great deep; that madest the depths of the sea a way for the redeemed to pass over?" — Isaiah 51:10 (ASV)

Are you not it which has dried the sea, the waters of
the great deep
That is, the Red sea, and the deep waters of it; as it did, by causing a strong east wind to blow, which drove the sea back, and made it a dry land, in the midst of which the children of Israel walked as on dry land, (Exodus 14:21Exodus 14:29).

And the same arm and mighty power can and will dry up the waters of the river Euphrates, to prepare the way of the kings of the east, (Revelation 16:12).

that has made the depths of the sea a way for the ransomed to pass
over ?
divided the waters of the sea, made a path through them for the Israelites that were redeemed out of Egyptian bondage and slavery, to pass over, and so to go to Canaan's land.