Grand Walker Hill Riverpark is a swimming pool using water comprised of alkali ingredients such as sodium and potassium from underground granite. Since it opened in 1994, the Riverpark is one of Seoul's most popular summer getaways to enjoy swimming. Located by the Hangang River and Achasan Mountain, it provides fresh air as well as the beautiful nature scenery. People can use any of the various facilities, including the main pool, lazy river, swimming pool for children, pool-side restaurant offering special summer lunch, and sun tanning beds.