Ara Waterway flows 18 kilometers from the Hangang River to the West Sea. Opened in 2012, the waterway serves to quickly remove excess water from the surrounding areas to prevent flooding. The waterway also serves as a key route for transporting cargo via ship, as well as a natural green space.

The idea of Ara Waterway started nearly 800 years ago during the Joseon dynasty by King Gojong. Unfortunately, his plan could not be completed at that time due to technical obstacles and the difficult state of the country. After countless efforts and preparation, the construction of the waterway began in 2009 and opened in 2012.