The river that "went out of Eden to water the garden," sharing the identical yatsa root now describing water flowing from the temple instead.
Revelation 22:1 completes this same river image, now sourced directly in the throne of God and of the Lamb.
He brought me back to the door of the house; and behold, waters flowed out from under the threshold of the house eastward, for the front of the house faced toward the east. The waters came down from underneath, from the right side of the house, on the south of the altar.
A river went out of Eden to water the garden; and from there it was parted, and became the source of four rivers.
He showed me a river of water of life, clear as crystal, proceeding out of the throne of God and of the Lamb,
This river completes the book's Eden-restoration arc: a temple that began as measured stone now overflows with water that heals even the Dead Sea itself.