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池 Travel and Tourism Tips

• Umijigoku

  It is the largest in Beppu Jigoku and features a cobalt blue pond. Umi Jigoku got its name because the color of the pond looks blue like the sea. T...

  

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  池

  [+]大分県別府市

• Shirogane Blue Pond Biei

  The secret to the blue color of Blue Pond is the aluminum ions contained in the water. Aluminum ions absorb and reflect blue light from sunlight, whic...

  

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  池

  [+]北海道上川郡

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