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prefecture (ken), extreme western Honshu, Japan, bordered by the Sea of Japan (north), the Shimonoseki-kaikyo (Shimonoseki Strait; southwest), and the Inland Sea (south). Most of its 2,355-sq-mi (6,100-sq-km) area is composed of plateaus and hills, and there are no extensive plains. The limestone caves and outcroppings of the Akiyoshi-dai (plateau) in the west present a typical karst formation and are widely known tourist attractions. Rice and mandarin oranges are grown, and there is a large deep-sea fishery catch. Coal is mined at Omine and limestone and marble at Akiyoshi. Industries produce iron and steel, chemicals, and lumber.