Semboku is a city located in Akita Prefecture, Japan. As of 31 January 2023, the city had an estimated population of 24,045 in 10,398 households, and a population density of 22 persons per km2. The total area of the city is 1,093.56 square kilometers (422 sq mi).

Akita Prefecture [a̠kʲita̠] is a prefecture of Japan located in the Tōhoku region of Honshu. Its population is estimated 915,691 and its geographic area is 11,637 km2. Akita Prefecture is bordered by Aomori Prefecture to the north, Iwate Prefecture to the east, Miyagi Prefecture to the southeast, and Yamagata Prefecture to the south.