Blue Pond
By: cshimokita : January 17th, 2020-03:21
is a man-made pond that is the result of work on the 美瑛川 (Biei River), carried out after the 1988 eruption of Mount Tokachi, to protect the town of Biei from volcanic mud flows. The color is thought to result from the presence of colloidal aluminium hydro...