The stone walls of Pasasan Fortress stretch along the ridge of the 250-meter-high Pasasan Mountain. The fortress is strategically situated for national defense by being located at the edge of the river bank, from which you can see both upstream and downstream. It is said that the fortress was constructed during the reign of the King Pasa, the 5th ruler of the Silla Kingdom. The walls stretch over 1,800 meters in length. At its highest point, the wall is 6.25 meters tall, and 1.4 meters tall at its lowest point.