Garden of Eden

 Genesis 2:14 states that Eden was a tributary of Euphrates and Tigris. It is the northern region of these two rivers. It also flows to Cush, which some scholars interepret as Ethiopia. Others interpret it as another colonony (Mount Kusheh) established by a tribe migrated from an Asiatic province of the same name (Catholic Encyclopedia). Genesis 2:10 A river flows out of Eden to water the garden, and from there it divides and becomes four branches. 11The name of the first is Pishon; it is the one that flows around the whole land of Havilah, where there is gold; 12and the gold of that land is good; bdellium and onyx stone are there. 13The name of the second river is Gihon; it is the one that flows around the whole land of Cush. 14The name of the third river is Tigris, which flows east of Assyria. And the fourth river is the Euphrates.
It is interesting to note that Jewish captives were taken to Babylonia and spent almost 50 years (587-538 BC) there. It is almost certain that they absorbed the Babylonian flood story and the story of creation.  
Some scholars argue that the Hebrew word Eden may have been derived fro Akkadian "Edinu," which originated in the Sumerian word, Edin (plain). For this reason, the Euphrates-Tigris plain is considered to be the site of the Garden of Eden. It is most likely the Jews absorbed the story during the Babylonian captivity.

In the center of the Garden, there was a tree of life. Only the Hebrew and the Assyrian/Babylonian literature share the legend of the tree of life.

Genesis 2:8 And the LORD God planted a garden in Eden, in the east; and there he put the man whom he had formed. 9Out of the ground the LORD God made to grow every tree that is pleasant to the sight and good for food, the tree of life also in the midst of the garden, and the tree of the knowledge of good and evil.

The legend of Eden may have originated in Dilmun (now Bahrain).

In the Epic of Gilgamesh, he is the king of Uruk and journed to Dilmun to find answers to the questions he had about life when his dearest friend, Enkidu, had died in battle. Enki and Ninhursag were two gods, and husband and wife, and like Adam and Eve, enjoyed good life as long as they lived near the tree of life in Dilmun (Barry Banstra).

 In Septuagint, a Greek translation of the Old Testament, Garden of Eden is translated as Paradise, a Persian word, which shows the influence of Persia after the Babylonian captivity.