Namhansanseong Fortress

Namhansanseong is a historical mountain fortress city 25 km southeast of Seoul, South Korea. It sits approximately 480 m above sea level and is aligned with the ridges of the mountain for maximum defensibility. The fortress, stretching 12 km in length, protects a vast area used as an emergency capital city during the Joseon Dynasty of Korea (1392–1910).

Namhan Mountain is a 460 m peak in Gyeonggi-do province, South Korea. It lies on the border between southern Seoul and the city of Gwangju (not to be confused with Gwangju Metropolitan City).An old stone-walled fortress named Namhansanseong stands at the top, and is a tourist attraction.