Sanasagyegok Valley, located in Yongmunsan Mountain, is characterized by its ample x_width, crystal-clear water, and abundant water volume. The thick forests and slopes of Yongmunsan Mountain offer stunning views, attracting many visitors during the summer vacation period. Approximately 100m up from the valley's entrance is Hamwanghyeol Cave, associated with the legend of Hamwang, a fierce warlord from the Goryeo dynasty. Further up, the Buddhist Sanasa Temple can be found.