is a city located in Yamanashi Prefecture, Japan. , the city had an estimated population of 31,526 in 13,147 households, and a population density of 120 persons per km². The total area of the city is . The city is the home of the indigenous Koshu grape and is synonymous with viticulture and wine production in Japan. Geography Kōshū is in northeastern Yamanashi Prefecture, occupying the eastern portion of the Kofu Basin. Parts of the city are within the borders of the Chichibu-Tama-Kai National Park. The peak of Mount Daibosatsu, 2057 meters, is within the city limits. Rivers Fuefuki River Omo River(Yamanashi) Hi River Neighboring municipalities Yamanashi Prefecture Yamanashi Fuefuki Ōtsuki Kosuge Tabayama Saitama Prefecture Chichibu Climate The city has a climate characterized by characterized by hot and humid summers, and relatively mild winters (Köppen climate classification Cfa). The average annual temperature in Kōshū is 10.1 °C. The average annual rainfall is 1477 mm with September as the wettest month. The temperatures are highest on average in August, at around 22.5 °C, and lowest in January, at around -1.8 °C. Demographics Per Japanese census data, the population of Kōshū has declined in recent decades. History Kōshū is located near the center of ancient Kai Province and contains many ruins from the Jōmon period and burial mounds from the Kofun period. During the Heian period, the area was developed in shōen under control of the Minamoto clan, which devolved into feudal holdings by the Nikaido clan and later the Takeda clan from the Kamakura through Sengoku periods. During the Edo period, all of Kai Province was tenryō territory under direct control of the Tokugawa shogunate. Following the Meiji restoration, the area was organized into villages within Yamanashi District of Yamanashi Prefecture, which was later divided into Higashiyamanashi District and Nishiyamanashi District Many of these villages were consolidated into the city of Enzan, the town of Katsunuma, and the village of Yamato by April 1, 1955. The modern city of Kōshū was established on November 1, 2005, from the merger of these three municipalities. Government Kōshū has a mayor-council form of government with a directly elected mayor and a unicameral city legislature of 18 members. The city supplies two members to the Yamanashi Prefectural Assembly. Economy Most of the area of the city is agricultural, and is especially known for its production of peaches, grapes and wine. Education Kōshū has 14 public