Achasan

Achasan () is a hill that sits between the Gwangjin District of Seoul and Guri of Gyeonggi in South Korea. It has an elevation of .

There is an extensive system of trails on the Achasan and Yongsan mountains with numerous entrances. People often hike from Yongmasan () and go to Achasan, or vice versa. Either trail takes about two hours. It has an elevated view of the Han River and of Seoul. At the halfway observation deck and the summit, there is a view of the upper stream of the Han River and the cities of Guri and Hanam. From Achasan Fort the Han River is visible almost in its entirety as it flows through Seoul). This is the closest vantage point for viewing the Han River from above.