Ōnuma Quasi-National Park (大沼国定公園 Ōnuma Kokutei Kōen) is a 90.83 km2 (35.07 sq mi)[1] quasi-national park on the Oshima Peninsula in southwest Hokkaidō, Japan. The park encompasses the volcanic Hokkaidō Komagatake (北海道駒ケ岳 Hokkaidō Koma-ga-take ) as well as the Ōnuma (大沼 ) and Konuma (小沼 ) ponds, which abut against the west slope of the mountain. The park, which was designated as quasi-national in 1958, is the smallest major park in Hokkaidō.