There are three peaks centered on the northeast main peak at the mountain top, and within the summit is a slightly opened oval-shaped crater to the east and west. The overall figure of the cone forms a horseshoe-shaped crater that is open thinly to the east. All slopes of the volcanic cone are covered in grass, presenting the visage of a beautiful and classic Jeju volcanic cone.
Ground cover plants such as Ranunculus and Korean Pasque Flower grow naturally on the cone. The cone’s name is derived from the fact that it looks like a dragon (Yong) lying down, and is written as Yongwaak in Chinese characters. Another theory holds that the large dent in the middle of the mountain looks like a place where a dragon lied down, leading to the name Yongnuni Oreum Volcanic Cone.