is a city located in Akita Prefecture, Japan. , the city had an estimated population of 25,857 in 10,584 households, and a population density of 24 persons per km2. The total area of the city is . Geography Semboku is located in the mountains of central Akita Prefecture, bordering on Iwate Prefecture and the Ōu Mountains on the east. Lake Tazawa, the deepest lake in Japan, is located in the center of the city borders. Parts of the city are within the borders of the Towada-Hachimantai National Park. Neighboring municipalities Akita Prefecture Akita Kitaakita Kazuno Daisen Iwate Prefecture Hachimantai Shizukuishi Nishiwaga Climate Semboku has a Humid continental climate (Köppen climate classification Dfa) with large seasonal temperature differences, with warm to hot (and often humid) summers and cold (sometimes severely cold) winters. Precipitation is significant throughout the year, but is heaviest from August to October. The average annual temperature in Semboku is . The average annual rainfall is with July as the wettest month. The temperatures are highest on average in August, at around , and lowest in January, at around . History The area of present-day Semboku was part of ancient Dewa Province. During the Edo period, the area came under the control of the Satake clan, who had been relocated to Kubota Domain from their former holdings in Hitachi Province. After the start of the Meiji period, the area became part of Semboku District, Akita Prefecture in 1878. The town of Kakunodate was established on April 1, 1889 with the establishment of the modern municipalities system. The city of Semboku was established on March 22, 2005, from the merger of the towns of Kakunodate and Tazawako, and the village of Nishiki (all from Semboku District). Demographics Per Japanese census data, the population of Semboku peaked in the early 1960s and has since declined to pre-1920 levels. Government Semboku has a mayor-council form of government with a directly elected mayor and a unicameral city legislature of 18 members. The city contributes one member to the Akita Prefectural Assembly. In terms of national politics, the city is part of Akita District 3 of the lower house of the Diet of Japan. Economy The economy of Semboku is based on agriculture, forestry and seasonal tourism. One event that attracts many tourists is the Rokugō Kamakura Festival, which is held each February 11 to 15. Education Semboku has seven public elementary schools and