The Gangseo Marsh Ecological Park is an eco-park located on the Hangang River between the southern side of Banghwadaegyo Bridge and southern side of Haengjudaegyo Bridge. Established in July 2007, the park is partly comprised of low wetlands, freshwater lakes, and various aquatic plants. Eco-trails wind around the park through reed areas, around willow trees, and past the migratory bird observation. At the park, visitors can watch and learn about a variety of migratory birds during summer and winter or join one of the park’s organized eco-education programs.