There is no telling where the Garden of Eden was because the world was completely blasted by Noah’s Flood. If you want to trace humans back to their post flood stepping off point, then we should be looking in the area the Bible describes as the mountains of Ararat (plural=range, not Mt. Ararat, as is commonly believed), probably located somewhere between the Black Sea and the Caspian Sea.
hmm...
Then it could have been Ethiopia.