Military Demarcation Line
CP No. 3, next to the Bridge of No Return, was the northernmost UNC checkpoint, and it was visible from OP No. 5 only during the winter months. During the summer months, only the top of CP No. 3 was visible from one other UNC checkpoint (CP No. 2). Running across the middle of the bridge was the Military Demarcation Line between North Korea and South Korea.