landlocked ken (prefecture), central Honshu, Japan. Much of its area is mountainous, including the peaks of Mount Shirane (10,472 feet [3,192 m]) in the northwest and Mount Fuji (12,388 feet) on the southern border. The prefecture is drained by the Fuji River and its tributaries. The five lakes associated with Mount Fuji-Yamanaka, Kawaguchi, Sai, Shoji, and Motosu-are located in the south
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