ken (prefecture), Honshu, Japan, lying on the Pacific coast of the Kanto Plain. It consists of the Boso Peninsula, which lies east of Tokyo Bay and south of the Tone River. Surpluses of rice, vegetables, eggs, and flowers are produced for Tokyo, and offshore fisheries flourish. The Tokyo-Yokohama industrial belt (see Keihin Industrial Zone) has expanded into Chiba prefecture to include the Keiyo Industrial Zone (q.v.). Factories built on reclaimed land produce chemicals, iron, steel, petroleum products, and sake. Large natural-gas deposits have been tapped.
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