Albert Barnes Commentary Psalms 69:34

"Let heaven and earth praise him, The seas, and everything that moveth therein." — Psalms 69:34 (ASV)

Let the heaven and earth praise him - All things; all above and all below.

The seas - The waters - the oceans. This is in accordance with what often occurs in the Scriptures, when all things, animate and inanimate, are called on to praise God. Compare (Psalms 148:1–14).

And everything that moveth therein - Margin, as in Hebrew, “creepeth.” Compare the notes at (Psalms 8:8). See also the notes at (Isaiah 55:12).