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Lake Ōnuma (Wakkanai)

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Lake in Wakkanai, Hokkaidō, Japan

Lake Ōnuma
大沼 (Japanese)
Ōnuma with Sōya Misaki Wind Farm behind
Lake Ōnuma is located in HokkaidoLake ŌnumaLake ŌnumaShow map of HokkaidoLake Ōnuma is located in JapanLake ŌnumaLake ŌnumaShow map of Japan
LocationWakkanai, Hokkaidō
Coordinates45°22′50″N 141°45′34″E / 45.38045°N 141.75939°E / 45.38045; 141.75939
Primary outflowsKoetoi River
Surface area4.67 km (1.80 sq mi) (2018)

Ōnuma (大沼) is a low-lying lake in Wakkanai, Hokkaidō, Japan. Its surface area of 4.67 km (1.80 sq mi) makes it, by this metric, the twentieth largest on the island. It is located a short distance inland from Sōya Bay, with which it is connected by the lower reaches of the Koetoi River, and is six kilometers east of the urban center of Wakkanai. It is also known as Shupunto Swamp from its Ainu name meaning "swamp belly"

Birdlife

Ōnuma provides a resting point in the autumn for Whooper swans, mute swans, white-fronted geese, and grey heron from Siberia on their way to their winter grounds, and again in spring upon their return. On the north shore is the Wakkanai City Onuma Bird Observation Center (Onuma Birdhouse), allows visitors to see wild birds from the observation room.

History

From 1943 to 1945, the Wakkanai detachment of the Imperial Japanese Navy's Ōminato Naval Air Group was based on the north side of Ōnuma (near the current Ōnuma Birdhouse) and patrolled the Sōya Strait with Zero-type floatplanes. On October 11, 1943, the Wakkanai detachment's floatplanes attacked the submarine USS Wahoo (SS-238), which was attempting to break through the Sōya Strait, with depth charges and guided it to surface ships, contributing to its sinking.

  • Lake Onuma Lake Onuma

See also

References

  1. 付1 湖沼面積 [Appendix One: Lakes by Surface Area] (PDF) (in Japanese). Geospatial Information Authority of Japan. 1 October 2018. Archived from the original (PDF) on 9 June 2019. Retrieved 28 September 2019.
  2. 大沼野鳥観察館（大沼バードハウス） [Ōnuma Wild Bird Observatory (Ōnuma Bird House)] (in Japanese). Wakkanai City. Retrieved 28 September 2019.

External links

Media related to Onuma (Wakkanai) at Wikimedia Commons

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