The fulness thereof; all those creatures wherewith it is replenished, which by a poetical strain are invited to praise God. See Poole on "Psalms 96:11", See Poole on "Psalms 96:12", See Poole on "Psalms 96:13".
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.