In 1988, the tallest volcano in the Tokachi Volcanic Group from Daisetsuzan National Park, Hokkaidō in Japan— Mount Tokachi— erupted. In order to protect the nearby town of Biei from mudflows, Biei River was treated. This process accidentally put colloidal aluminium hydroxide in the water which then caused the water to turn this gorgeous hue of blue. So grateful that despite […]
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