JSA (Joint Security Area)

The Joint Security Area (JSA), also called Panmunjom, is the only portion of the Korean Demilitarized Zone (DMZ) where troops from the Korean People's Army (KPA) of North Korea and the United Nations Command (UNC), which includes South Korean and U.S. personnel, stand in direct proximity. It sits roughly 53 km north of Seoul along the Military Demarcation Line (MDL) established by the Korean Armistice Agreement signed on 27 July 1953.

The JSA was created so that armistice commissions — primarily the Military Armistice Commission (MAC) and the Neutral Nations Supervisory Commission (NNSC) — could meet without either side crossing the MDL. Several light-blue conference huts (the T-buildings) straddle the line; inside them, the MDL runs across the negotiating table, allowing delegates to speak across the border while remaining on their own territory.

The site has been the stage for repeated incidents and high-profile diplomacy:

• The Axe Murder Incident of 18 August 1976, in which two U.S. Army officers, Captain Arthur Bonifas and First Lieutenant Mark Barrett, were killed by North Korean soldiers during a tree-trimming operation. The U.S. response, Operation Paul Bunyan, followed three days later.
• The defection of KPA soldier Oh Chong-song on 13 November 2017, who was shot multiple times while crossing the line and was recovered by UNC personnel.
• The inter-Korean summit of 27 April 2018, when South Korean President Moon Jae-in and North Korean leader Kim Jong-un met at the Peace House on the southern side.
• The Trump–Kim meeting of 30 June 2019, during which U.S. President Donald Trump briefly stepped across the MDL into North Korean territory.

Following the 2018 Panmunjom Declaration, both sides agreed to disarm the JSA of firearms and reduce guard posts, though the security arrangement has fluctuated with broader inter-Korean tensions. The JSA remains administered under the 1953 Armistice rather than a peace treaty.