There are other Bible verses that use the phrase "enthroned between the cherubim."
1 Samuel 4:4
2 Samuel 6:2
2 Kings 19:15
1 Chronicles 13:6
Isaiah 37:16 Almighty, the God of Israel, between the , you alone are God over all the kingdoms of the earth. You have made heaven and earth.
And several of those also mention how God reigns over the nations.
The cherubim are angels. They are represented on the top of the Ark of the Covenant where Moses placed the Ten Commandments and other things. On the top, or lid, of the Ark - between the cherubim - is the mercy seat.
It is at the Mercy Seat that we find forgiveness of sin and can approach God. The Ark and the Mercy Seat show us that the great Almighty God, who made heaven and earth, reached out to us with love and mercy so He could have a relationship with us.