Two hundred meters upstream from Dodamsambong Peaks is a large rainbow-shaped stone gate on the left side of the river. This oddly-shaped stone arch is called Seongmun, which means Stone Gate. Due to its fascinating scenery, Seongmunm is the second of Danyang’s Eight Scenic Beauties. To the left of the Stone Gate is a small cave. Inside the cave is Okdap (Stone Field), which is believed to have been cultivated by an old enchantress. The legend of Okdap says that an old enchantress who lived in heaven once came to the earth to get water and then dropped her binyeo (traditional Korean hairpin) near Seongmun. As she searched for her binyeo, she was extremely impressed by the beautiful views. Mesmerized, she left heaven and lived near Seongmun as an ordinary peasant, growing crops and expanding farmlands.