Gihon: the name of the second river flowing out of Eden, the one said to wind around the whole land of Cush.
The name is a description before it is a label. It is built on a Hebrew verb (גִּיחַ) used for anything that breaks out with force: fighters springing from an ambush, the sea bursting from the womb, a river rushing into an animal's mouth. So the word means roughly "Gusher." It says what the water does, not where the water is.
That is exactly why the name by itself settles nothing about which river Genesis has in mind. Everything hangs on the words that follow it, "the whole land of Cush." Elsewhere in the Hebrew Bible Cush normally means Nubia, the region south of Egypt, and on that reading the Gihon is the Nile, which is how most ancient Jewish and Christian readers understood it. Others have argued that Cush here points to a people living east of Mesopotamia instead, which would put the Gihon in western Iran. Many scholars conclude that the passage is not drawing a map at all.
What every reading has in common is the picture: a single source inside God's garden, dividing into rivers (נָהָר) that run out to the far corners of the world. Two of the four, the Tigris and the Euphrates, are rivers anyone could point to. The other two, including the Gihon, are not, and that mixture of the familiar and the unplaceable may well be the point.
Disputed
Which river, if any, the Gihon of Genesis 2:13 names. The question turns almost entirely on what "the land of Cush" means in that verse.
- majorityThe rivers of Eden depict an ideal, paradisal landscape rather than a route that can be mapped, so the Gihon is not to be matched with any known river.; Claus Westermann, Genesis 1-11: A Commentary, Continental Commentary (Minneapolis: Augsburg, 1984); Gordon J. Wenham, Genesis 1-15, Word Biblical Commentary 1 (Waco: Word, 1987); Terje Stordalen, Echoes of Eden: Genesis 2-3 and Symbolism of the Eden Garden in Biblical Hebrew Literature (Leuven: Peeters, 2000)
- minorityCush means Nubia, as it normally does elsewhere in the Hebrew Bible, so the Gihon is the Nile.; Josephus, Jewish Antiquities 1.1.3
- minorityCush here names the Kassites, east of Mesopotamia, which places the Gihon in western Iran, most likely the Kerkha (ancient Choaspes) or the Karun.; E. A. Speiser, "The Rivers of Paradise," in I Studied Inscriptions from Before the Flood, ed. R. S. Hess and D. T. Tsumura (Winona Lake: Eisenbrauns, 1994), 175-182