Punch Bowl in Yanggu-gun Gangwon-do is a highland basin situated 400-500 meters above sea level. The name "Punch Bowl" comes from the basin's resemblance to a large punch bowl. The town has around 1,700 residents, and is the only town that is located inside the Civilian Access Control Line.
Along with the nearby Daeamsan Mountain, Punch Bowl was once a ferocious battlefield during the Korean War. Several monuments were erected in memory of the deceased souls, while some remnants of the War still remain in the basin. Since the War, civilian access has been limited to Punchbowl and Daeamsan Mountain, allowing the natural environment in the area virtually unscathed. Rare flora and fauna reside in the area, and on top of the Daeamsan Mountain is Yongneup Swamp (Natural Monument No.246), Korea's one and only high moor and time-honored treasure trove for the ecosystem.
Also, there is the 4th Infiltration Tunnel that was unearthed in March 1990. Unlike the rest of the tunnels (1st, 2nd and 3rd Tunnels), visitors can go into the tunnel riding in a cable car. From the Eulji Observatory nearby, visitors may enjoy the view of the four peaks of Naegeumgang area including the Birobong of Geumgangsan Mountain. To enter the tunnel and the observatory, visitors must fill out an entry application at the Yanggu Unification Center.