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ken (prefecture), northeastern Honshu, Japan, facing the Pacific Ocean. Its area of 5,322 square miles (13,784 square km) is mostly mountainous, and settlement is concentrated in small interior basins and along the coast. Inawashiro Lake, 40 square miles (100 square km) in area, occupies the centre of the ken. Fukushima ken contains the southern extension of Bandai-Asahi National Park, encompassing the region of volcanic Bandai and Azuma mountains. The lower volcano slopes are dotted with lakes and swamps, many of which were formed by the eruption of Mount Bandai in 1888. Numerous spas serve the area.