Ariake Sea in the context of "Kagoshima Prefecture"

Fukuoka Prefecture (福岡県, Fukuoka-ken; Japanese pronunciation: [ɸɯ̥.kɯꜜ.o.ka, -kɯ.o.kaꜜ.keɴ]) is a prefecture of Japan located on the island of Kyūshū. Fukuoka Prefecture has a population of 5,109,323 (1 June 2019) and has a geographic area of 4,986 km (1,925 sq mi). Fukuoka Prefecture borders Saga Prefecture to the southwest, Kumamoto Prefecture to the south, and Ōita Prefecture to the southeast.

Fukuoka is the capital and largest city of Fukuoka Prefecture, and the largest city on Kyūshū, with other major cities including Kitakyushu, Kurume, and Ōmuta. Fukuoka Prefecture is located at the northernmost point of Kyūshū on the Kanmon Straits, connecting the Tsushima Strait and the Seto Inland Sea across from Yamaguchi Prefecture on the island of Honshu, and extends south towards the Ariake Sea.

Saga Prefecture (佐賀県, Saga-ken; Japanese pronunciation: [saꜜ.ɡa, -ŋa, sa.ɡaꜜ.keɴ, -ŋaꜜ.keɴ]) is a prefecture of Japan located on the island of Kyushu. Saga Prefecture has a population of roughly 780,000 and has a geographic area of 2,439 square kilometres (942 sq mi). Saga Prefecture borders Fukuoka Prefecture to the northeast and Nagasaki Prefecture to the southwest.

Saga is the capital and largest city of Saga Prefecture, with other major cities including Karatsu, Tosu, and Imari. Saga Prefecture is located in the northwest of Kyūshū covering an isthmus-like area extending between the Sea of Japan and the Ariake Sea. Saga Prefecture's western region is known for the production of ceramics and porcelain, particularly in the towns of Karatsu, Imari, and Arita.

Kumamoto Prefecture (熊本県, Kumamoto-ken; Japanese pronunciation: [kɯ.ma.mo.to, -toꜜ.keɴ]) is a prefecture of Japan located on the island of Kyūshū. Kumamoto Prefecture has a population of 1,683,115 (as of 1 October 2025) and has a geographic area of 7,409 square kilometres (2,861 sq mi). Kumamoto Prefecture borders Fukuoka Prefecture to the north, Ōita Prefecture to the northeast, Miyazaki Prefecture to the southeast, and Kagoshima Prefecture to the south.

Kumamoto is the capital and largest city of Kumamoto Prefecture, with other major cities including Yatsushiro, Amakusa, and Tamana. Kumamoto Prefecture is located in the center of Kyūshū on the coast of the Ariake Sea, across from Nagasaki Prefecture, with the mainland separated from the East China Sea by the Amakusa Archipelago. Kumamoto Prefecture is home to Mount Aso, the largest active volcano in Japan and among the largest in the world, with its peak 1,592 metres (5,223 ft) above sea level.