Aka is a village located in Tagawa District, Fukuoka Prefecture, Japan. As of 31 December 2023, the village had an estimated population of 3,065 in 1509 households, and a population density of 120 persons per km². The total area of the village is 31.98 km2 (12.35 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.