http://www.kjvbible.org/rivers_of_the_garden_of_eden.html
the 4 rivers of Eden. It gets real interesting about halfway down the page at the link, and this theory tends to place Eden not in Iraq, but within Israel’s biblical jurisdiction.
The description of those four rivers don’t really fit the geography and has always been a little frustrating — all flow out of Eden, but one surrounds Ethiopia (in Africa, south of Egypt), another is east of Assyria, one surrounds Havilah, and the other is the Euphrates which is sill there. If we look to the source of the Euphrates, it is nowhere near the source of, say, the Blue Nile which flows out of Ethiopia (which is more or less bordered by the White Nile).
This has an interesting discussion of this issue:
http://en.wikipedia.org/wiki/Havilah
sidebars:
http://www.varchive.org/ce/baalbek/eden.htm
http://www.varchive.org/itb/rift.htm