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.
| Ōnuma Quasi-National Park | |
|---|---|
| 大沼国定公園 | |
 Hokkaidō Komagatake, in the center of the park, at dusk. | |
  | |
| Location | Hokkaidō, Japan |
| Nearest city | Nanae |
| Coordinates | 42°00′44″N 140°40′16″E / 42.0121°N 140.671°E[1] |
| Area | 90.83 km2 (35.07 sq mi) |
| Established | July 1, 1958 |
| Official name | Onuma |
| Designated | 3 July 2012 |
| Reference no. | 2058[2] |
Ōnuma and Konuma were created when mudflows due to eruptions of Hokkaidō Koma-ga-take dammed up depressions at the base of the mountain. The ponds, which are dotted with watershields, are surrounded by birch and maple forests.
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- J-IBIS (in Japanese)
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