Name Biei wear and a small town at the foot of Mount Tokachi, and located next to a small pond, which attracts tourists from all over the world for its unusual ultramarine color of the water. "Blue" pond Biei is located on the left bank of the river Bieygava Hokkaido.

It is remarkable, but the pond is not natural and artificial origin. After the eruption of the volcano in 1988 Tokachi increased risk of vanishing from the slopes of the mountain of mud flow in the direction of the city. It was therefore decided to build a dam, which was opened in the next year. After its construction in the forest began to collect water, and so formed a pond. Its origin has not caused any particular problems, but the reasons for the unusual color of the water, besides the ability to change its color remains a mystery for the past quarter of a century.

Scientists are trying to explain this unique phenomenon, and one of their versions, unusual color is obtained by mixing water from the hot springs nearby, the water of the river, which is full of aluminum hydroxide. Because of impurities, the water in the pond reflects sunlight and at different hours when the sun's rays fall on the water at different angles, acquires different shades - from bright turquoise to greenish-gray.

Mysterious pond was added and the trunks of birch and larch, which protrude from the water over the entire area of ​​the reservoir. Dimensions small pond - you can get around on foot in just half an hour. However, many photographers come here to catch the lens changeable color of the water.

Popularity pond Biei increased after 2012, Apple posted his photograph taken by photographer Kent Shiraishi, in its new operating system, OS X Mountain Lion. In this picture imprinted, on the shore of the pond Biei went to the first snow. In winter, the pond is not less attractive, because through the thin crust of ice translucent turquoise water, and sticking out of the water the trees are covered with snow flakes.