ken (prefecture), Honshu, Japan, in the northern Kanto chiho (region). It occupies an area of 2,476 square miles (6,414 square km). The eastern border with Ibaraki prefecture is formed by Mount Yamizo and associated mountains. Western Tochigi prefecture is occupied by the Ashio Highlands and bordered by the mountains associated with Mounts Taishaku and Shirane. The Ashio Highlands are the site of the resorts of Nikko, Shiobara, and Kawaji. Nikko National Park in Tochigi contains Lake Chuzenji. The main river in the prefecture, the Kinu River, runs longitudinally between the eastern and western mountain groups
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