Fukushima Prefecture is a prefecture of Japan located in the TÅhoku region of Honshu. Fukushima Prefecture has a population of 1,771,100 and has a geographic area of 13,783.90 square kilometres. Fukushima Prefecture borders Miyagi Prefecture and Yamagata Prefecture to the north, Niigata Prefecture to the west, Gunma Prefecture to the southâŠFukushima Prefecture is a prefecture of Japan located in the TÅhoku region of Honshu. Fukushima Prefecture has a population of 1,771,100 and has a geographic area of 13,783.90 square kilometres. Fukushima Prefecture borders Miyagi Prefecture and Yamagata Prefecture to the north, Niigata Prefecture to the west, Gunma Prefecture to the southwest, and Tochigi Prefecture and Ibaraki Prefecture to the south.