Umi is a town located in Kasuya District, Fukuoka Prefecture, Japan. As of 31 March 2024, the town had an estimated population of 36,907 in 16691 households, and a population density of 1200 persons per km². The total area of the town is 30.21 km2 (11.66 sq mi)

Fukuoka Prefecture is a prefecture of Japan located on the island of Kyūshū. Fukuoka Prefecture has a population of 5,109,323 and has a geographic area of 4,986 km2. Fukuoka Prefecture borders Saga Prefecture to the southwest, Kumamoto Prefecture to the south, and Ōita Prefecture to the southeast.