Many biblical scholars believe that the Garden of Eden, the original home of Adam and Eve, was located in Sumer, at the confluence of the Euphrates and Tigris (or Hiddekel) rivers in present-day Iraq. They presume that the geographical references in Genesis relate to the situation from the ninth to the fifth centuries BC and that the Pison and Gihon were tributaries of the Euphrates and Tigris which have since disappeared. In fact, they may have been ancient canals.