Charles Ellicott Commentary Job 38:10

"And marked out for it my bound, And set bars and doors," — Job 38:10 (ASV)

And brake up for it my decreed place. —Rather, And prescribed for it my decree: that is to say, determined the boundaries of its dwelling. When we bear in mind the vast forces and unstable nature of the sea, it seems a marvel that it acknowledges any limits, and is held in restraint by them.