God describes the sacrificial system in the restored temple (46), and, something new, a river flowing from the sacrificial center, the altar, out into the world, healing the nations. As blood and water flowed from the side of Christ at His death on the cross, that true atonement for many is foreshadowed here as blood is shed on the altar and as water flows out into the world.
The land is divided among the 12 tribes, the priests, the city, and the prince. The city belongs to each of the tribes, and Yahweh is there. This was the fundamental need of the exiles: to know that God would be present in the land, in their city.