“A river flows out of Eden to water the garden and from there divides into four rivers” (Genesis 2:10). That’s the clue to finding Eden, some say. The four rivers that branch off of Eden’s river are the Tigris and Euphrates along with two others lost to history, possibly dry gullies by now: Pishon and Gihon. The Tigris and Euphrates flow out of the mountains of eastern Turkey. A Visual Walk Through Genesis, page 30.