Semiwon, Botanical garden in Yangpyeong County, South Korea.

Semiwon is a botanical garden in Yangpyeong that focuses on water plants and lotus flowers arranged across landscaped grounds with distinct growing zones. The space contains many plant varieties that coexist in aquatic environments and cultivated areas.

Semiwon was built with about 10 billion won of funding from Gyeonggi Province as a natural purification park. Its six ponds were laid out so that water from the Han River passes through them, losing heavy metals and suspended solids before flowing on to Paldang Dam. The grounds cover 180,000 m2 in Yongdam-ri, Yangseo-myeon, Yangpyeong County.

The name Semiwon comes from the saying "gwan-su-se-sim, gwan-hwa-mi-sim": seeing water cleanses the mind, seeing flowers beautifies it. Accordingly every path in the park is laid with red bricks shaped like washing boards. Inside are a world water-lily garden with about 100 species, an environmental education site, a test cultivation plot, an onggi jar terrace, the Gwanrandae pavilion overlooking Dumulmeori, a "Monet's Garden", and a yusanggoksu water channel.

The garden has wide paths connecting the different plant zones and is accessible for most visitors to walk through comfortably. Wear comfortable shoes and bring sun protection on warm days, as many areas have limited shade.

All the paths in Semiwon are paved with red bricks shaped like washboards, a reference to the old saying "gwanmul se sim, gwanhwa mi sim" (see water and cleanse the mind, see flowers and beautify the mind). The park's name comes from the same phrase, and the brick paths are meant to be walked while watching the Han River flow past.