The Garden of Eden
Now the LORD God had planted a garden in the east, in Eden; and there he put the man he had formed. And the LORD God made all kinds of trees grow out of the ground-trees that were pleasing to the eye and good for food. In the middle of the garden were the tree of life and the tree of the knowledge of good and evil.
A river watering the garden flowed from Eden; from there it was separated into four headwaters. The name of the first is the Pishon; it winds through the entire land of Havilah, where there is gold. (The gold of that land is good; aromatic resin and onyx are also there.) The name of the second river is the Gihon; it winds through the entire land of Cush. The name of the third river is the Tigris; it runs along the east side of Asshur. And the fourth river is the Euphrates.
There has been wide speculation about the location of the Garden of Eden. A popular theory believes that it lay in the lush and fertile are of land between the rivers Tigris and Euphrates in Mesopatamia, perhaps in what is now known as southern Iraq, but most scholars maintain that there isn't sufficient data to determine a specific location.
There have been efforts made to locate the Garden of Eden but not only has time been a debilitating factor, there has been the great flood that occurred in the time of Noah, which obliterated the entire region. The flood is perhaps also the reason the rivers Pishon and Gihon no longer exist.