Kōko-enKōko-en is a Japanese garden located next to Himeji Castle in Hyōgo Prefecture, Japan.HistoryIt was constructed in 1992 at the site of the lord's west residence, to commemorate the 100th anniversary of the establishment of the Himeji municipality. In 2017, Kōko-en signed a sister garden agreement with Rohō-en, the Japanese Friendship Garden, in its sister city, Phoenix, Arizona.LayoutThe garden is about 3.5 hectares and has nine different gardens.