A national park in the Kantō region, all the best things to do in Nikko National Park is located on the main island of Honshū in Japan. The park spreads over three prefectures: Tochigi, Gunma and Fukushima, and was established in 1934. The establishment of Nikkō National Park dates to the early 20th century. The Diet of Japan designated Nikkō an imperial park (帝国公園, teikoku kōen) in 1911. The National Parks Law was passed in 1931, and Nikkō National Park was established in 1934. The park was expanded throughout the 20th century. Oze National Park was once part of Nikkō National Park, but became a separate national park in 2007.