Let the sea roar, and the fulness thereof - See the notes at Psalms 96:11.
The world, and they that dwell therein - The habitable world - the land - in contradistinction from the sea. Let there be universal praise on the water and the land.
Related Commentaries of Psalms 98:7
Psalms 98:7
7 Let the sea roar, and the fulnessa thereof; the world, and they that dwell therein.