A former water treatment plant turned ecological park on an island in the Han River

An old water purification plant on a small island between Yeouido and Hapjeong. Instead of tearing it down, the city kept the concrete bones and let nature take over. Ivy-covered columns, water gardens in old filtration tanks, and Han River views on all sides.

Yes. It is not flashy, but walking through old industrial structures slowly being reclaimed by plants is genuinely memorable. Quiet, photogenic, and unlike anything else in Seoul. The view toward Yeouido from the island is fantastic, especially around sunset when the skyline lights up across the water.

Not a full-day destination. Pair it with Yanghwa Hangang Park, Mangwon Market, or Mangwon Hangang Park for a solid half day.

The park’s signature spot. The roof of an old reservoir was removed, leaving rows of concrete columns standing in the open. Ivy has wrapped around them over the years. Lush and green in summer, bare and sculptural in winter.

The best-preserved section of the old plant. Grey concrete walls, exposed rebar, plants growing through cracks. The park does not try to hide its industrial past here.

A shallow wading area for kids using water purified by the park’s own aquatic gardens. Popular with families in summer.

A small exhibition space in the old pump building covering the history of the island and the water plant. Quick stop, worth it if you are curious about the before and after. Closed Mondays.

The pedestrian bridge connecting the island to the Yanghwa side. Designed by French architect Rudy Ricciotti and completed in 2002. A pleasant walk on its own, especially at sunset.