Dennis Fink (Air Force) on Yongmun San, 1970

Yongmunsan Mountain: 1,157m high. It is located 8km Northeast of Yangpyeong and 42km east of Seoul. It is a branch of Gwanju Mountain Range, but independently has an elevated peak spreading 8km from the east to the west and 5km from the south to the north. The main peak is Yongmunsan and the mountains form large group with Doilbong Peak (864m) 5.5km to the northeast, Jungwonsan Mountain (800m) 4.5km to the east and Baekunbong Peak (940m) 3.5km to the southeast. The top of the mountain is flat and the ridge lines are well developed, especially between Yongmun and Jungwon where there are grand valleys known as, Yongye and Jogye. The plateaus in the middle of this site are above the 100m high rock cliff so it looks similar to Geumgangsan Mountain. The slope on the north side is low and on the south side is high. A lot of unique rocks, a deep valley and waterfall can be seen from there and there is a large plateau approximately 4? long and 700 to 1,100m high on the vast area of the northwestern side of Yongmunsan Mountain.