Well, working from biblical scriptures we know that there was a river that went out to water the land of Eden and the river parted into four riverheads at the garden. 

Genesis 2: 10-14 

10 Now a river went out of Eden to water the garden, and from there it parted and became four riverheads. 11 The name of the first is Pishon; it is the one which skirts the whole land of Havilah, where there is gold. 12 And the gold of that land is good. Bdellium and the onyx stone are there. 13 The name of the second river is Gihon; it is the one which goes around the whole land of Cush. 14 The name of the third river is Hiddekel it is the one which goes toward the east of Assyria. The fourth river is the Euphrates. 

We also see that where the first river Pishon skirted the land of Havilah where there was gold and some substance called bdellium and also onyx stone (volcanic glass) was found there. 

The second river was called Gihon which encompassed the land of Cush which is thought to be in Africa in modern day Sudan. 

The third river was called Hiddekel which went toward the east of Assyria. 

The fourth river is the Euphrates. 

Here's one generalized idea one person came up with as a possible location of Eden. The only problem with this map is Cush is not located where different ancient sources (Egyptian) say the land of Cush is located, which is modern day Sudan. 

This next map is a drawing of another map one person believes to be the original landmass before the "waters of the great deep" broke up in the Great Flood of Genesis. Notice how this map looks eerily like Pangaea? 

As ever, finding Eden may always be a mystery. 

[mods put this in the forum it goes in if this one is not the correct one].

http://test.abovetopsecret.com/forum/thread840845/pg1