A river (Galactic Arm) went out of Eden (the Galactic Core) where it divided into the four rivers (Galactic Arms) to supply Paradise in Qedem (The Orion Spur).
In this sense, the realm of Cush is identified with region of the Cassiopeia constellation on the Perseus Arm. Ashur is identified with the Orion constellation.
[http://en.wikipedia.org/wiki/Au%C3%B0humla River of Eden in Nordic Myth]
