A river went out from Eden to water the garden. From there it divided and became the source of four rivers.
Genesis 2:10 In-Context
Now the LORD God had planted a garden in the east, in Eden; and there he put the man he had formed.
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.)