This is the largest Israel ever was. David subdued the nations around him and Solomon held what his father had taken, so that the kingdom reached from the border of Egypt to the Euphrates.
Keep the map beside you as you read Kings and Chronicles. It will never be this size again — within a generation of Solomon’s death it is two smaller kingdoms, and from there the story is one of losing ground.
The reach of the kingdom under David and Solomon — 2 Samuel 8; 1 Kings 4.