Introduction to the Joint Security Zone: The "Joint Security Zone" actually straddles the North-South Military Demarcation Line, and the negotiating table in the Military Armistice Commission is located exactly in the middle of this line. On the military demarcation line, there are also seven sky-blue simple wooden houses built, which are the conference hall of the Military Armistice Commission established in accordance with the armistice agreement and the workplace of the Neutral Nations Supervisory Committee.