From the introduction: Once again, into the woods! This time the adventuring party find themselves not only in the middle of Greyhawk’s Iron Wood which lies just north of the Kron Hills and west of Verbobonc, but they will also find themselves in the middle of one of the greatest endeavors to overthrow all of Oerth. What secrets lie in the Iron Wood, beneath the waters of the hidden lake, or underneath the unnatural hill where lies the Ancient Temple of Karaan? Find out in the player characters’ greatest challenge of the River Campaign in these very pages: Chapter 10 of the Great Flanaess River Adventure!