![[Image1]It is a blue pond in Biei, Hokkaido, where the autumn leaves are beautiful.The reason why it is blue](https://img.cooljapan-videos.com/files/member_posts/image/f290f36af2bd1bfa0683e3f35cf6a7c7e2f43503.jpg)
It is a blue pond in Biei, Hokkaido, where the autumn leaves are beautiful.
The reason why it is blue is that the aluminum-containing water mixes with the rivers of the Biei River, and it looks blue when it is illuminated by the sun. It's one of those places where the word "secluded" is appropriate.
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What did it look like to people in the past when it was not scientifically understood?
I imagine ? a lot of things
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