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ken (prefecture), north-central Honshu, Japan. It lies along the Sea of Japan and includes the offshore islands of Sado and Awa. Silt deposited by the Shinano and Ara rivers in the central part of the long coastline has created the lowland called the Echigo Plain, which contains the majority of the population. The rest of the prefecture is mountainous except for small southern coastal plains and lowlands along other river courses. Niigata is one of Japan's largest rice producers, providing major surpluses for shipment to city markets. Plentiful hydroelectric power generated in the interior mountains has stimulated industrial growth (chemicals, metals, machinery) in such cities as Niigata, Kashiwazaki, Naoetsu, Sanjo, and Takada. The prefecture also produces petroleum (Nagaoka, Kashiwazaki) and natural gas. Niigata is the prefectural capital and largest city. Area 4,857 square miles (12,579 square km). Pop. (1993 est.) 2,478,000.