Albert Barnes Commentary Psalms 95:5

"The sea is his, and he made it; And his hands formed the dry land." — Psalms 95:5 (ASV)

The sea is his – The margin, as in Hebrew, is “Whose the sea is.” That is, the sea belongs to him, with all that 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.