Mansugyegok Valley is a 4 km-long valley fed by the Samgacheon Stream, which originates from Cheonwangbong Peak in Songnisan Mountain and flows into Samga Reservoir. Its name refers to how it has enjoyed tens of thousands of years of age. Its clear water and lush forests make it a popular summer and forest bath destination. The summit of the Songnisan Mountain can be reached along the valley. There’s also a trail that leads to the Beopjusa Temple of Songnisan Mountain.