Gangju Pond is the orgin of the current Jinjuseong Fortress. It is unknown when the pond was first built, but the trees that grow around the pond are 500-600 years old, attesting to its history. During summer, the pond is filled with lotus blossoms, and it is a popular picnic location for students. The area around the pond was designated as an ecolocial park in 2004, creating a space for locals to relax and learn about the environment.