Isn’t Gihon one of the four rivers that flowed in the Garden of Eden?
It’s an article about a Biblical story but they use CE and BCE. I don’t understand this big aversion to using BC and AD, after all, what happened at that time to change the calendar?
http://www.kjvbible.org/rivers_of_the_garden_of_eden.html
the 4 rivers of Eden. It gets real interesting about halfway down the page at the link, and this theory tends to place Eden not in Iraq, but within Israel’s biblical jurisdiction.