Seonyudo Park is an ecological park built by reusing an old water treatment plant, located on Seonyudo island in the Han River at the middle of Yanghwa Bridge. Its landscape combines old concrete walls with moss, ivy, and the evergreen trees of the Garden of Time. The park is open from 6 a.m. to midnight and includes a greenhouse, a small exhibition hall, a small theater, and a riverside walking path, making it a half-day course. On spring weekends, visitor numbers are high and the trash bins tend to be crowded.