74:13 divide the sea. Psalm 74:13-17 is best understood as a commentary on Psalm 74:12: “For God is my king of old, working salvation in the midst of the earth.” The psalmist vividly recalls the ancient judgment of the great Flood, as assurance that He will eventually bring righteousness and peace out of sin and turmoil in this present world as well.
74:13 dragons in the waters. The mighty “dragons” in the waters, the same as “leviathan” (see also Job 41:1-34; Isaiah 27:1), were invulnerable to human weapons and were probably great marine reptiles, like dinosaurs. These “dragons” were broken and buried in the mighty waters and rushing sediments of the flood.