Introduction to artificial wetlands: The artificial wetlands in the Olympic Forest Park are divided into subsurface flow wetlands and surface flow wetlands. They can treat 2,000 tons of recycled water from Qinghe Sewage Treatment Plant and 20,000 tons of main lake recycled water every day. A large number of reeds, calamus and other wetland plants are planted in the subsurface wetland, while a large number of highly ornamental aquatic plants such as lotus are planted in the surface flow wetland. Large areas of reeds, cattails, sedges, calamus and cannas are blown by the breeze. There is a rustling sound, and being in it makes people feel like they are in a water town.