Genesis 2:10-15

Now a river flowed out of Eden to water the garden; and from there it divided and became four [branching] rivers. The first [river] is named Pishon; it flows around the entire land of Havilah, where there is gold. The gold of that land is good; bdellium (a fragrant, valuable resin) and the onyx stone are found there. The name of the second river is Gihon; it flows around the entire land of Cush [in Mesopotamia]. The third river is named Hiddekel (Tigris); it flows east of Assyria. And the fourth river is the Euphrates. So the LORD God took the man [He had made] and settled him in the Garden of Eden to cultivate and keep it.