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Sea of Cloud at Nishinoura-enchi-tenbousyo

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deltaworks--7.jpg Daikanbou-Observatory 縮略圖Sea of Cloud at Nishinoura-enchi-tenbousyoDaikanbou-Observatory 縮略圖Sea of Cloud at Nishinoura-enchi-tenbousyoDaikanbou-Observatory 縮略圖Sea of Cloud at Nishinoura-enchi-tenbousyoDaikanbou-Observatory 縮略圖Sea of Cloud at Nishinoura-enchi-tenbousyo

 The cloud that stays in the Aso caldera is called "Unkai". This meteorological phenomenon occurs only about 20 times a year.