The sea is his - Margin, as in Hebrew, "Whose the sea is." That is, The sea belongs to him, with all which it contains.
And he made it - It is his, "because" he made it. The creation of anything gives the highest possible right over it.
And his hands formed the dry land - He has a claim, therefore, that it should be recognized as his, and that all who dwell upon it, and derive their support from it, should acknowledge him as its great Owner and Lord.

The sea is his - The sea and the dry land are equally his, for he has formed them both, and they are his property. He governs and disposes of them as he sees good. He is the absolute Master of universal nature. Therefore there is no other object of worship nor of confidence.

The sea is his, and he made it,.... He made it, and therefore it is, and all creatures in it; he sets bounds to it, and its waves, and restrains the raging of it at his pleasure, Matthew 8:26,
and his hands formed the dry land; the whole world, all besides the sea, the vast continent; he is the Maker of it, and all creatures in it; without him was nothing made that is made; and, being the Creator of all things, is the proper object of worship, John 1:2, as follows.