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大沼国定公園の大沼。1640年の大噴火で折戸川が堰き止められ、小島が多数ある大沼・小沼などができた。
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Onuma1, Onuma (Nanae, Hokkaido)
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It is a marsh in Onuma Quasi-National Park.The Orito-gawa River was sinked off by the Great Eruption in 1640, and many small islands were formed, such as Onuma and Onuma.
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ja
大沼
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