Hokkaido’s Blue Pond

I was recently just browsing the internet when I found pictures both heavenly and horrible. It depicted a pond that was as blue as a swimming pool in a certain light going to a greenish color. It certainly looked beautiful with contrast between the pale leafless trees inside the water and the striking hues of the pond. I was shocked and mesmerized by the photograph and decided to research more about it.
There was not much information about Hokkaido’s Blue Pond. It was described as a touristic site and a beautiful sight to see. These words irked me as I felt that there was something more to the pond. After countless water tests, the cause of the colors was still not sure. However, widely accepted hypothesis is that it is due to an abnormal amount of aluminum hydroxide which reflects blue particles easily. This led me to question the origin of the pool. I found out that it was created by the erection of a dam to prevent mudflows in region. The water collects in the Blue Pond. While I could not find detailed information about the influence of aluminum hydroxide in water, I found a World Health Organization research showing that aluminum hydroxide is not poisonous to humans. It just means it is not harmful to animal organisms which might be the reason for the lack of interest in the Blue Pond component. But does that mean the Blue Pond is completely safe?https://sustainabilityllc.wordpress.com/wp-admin/options-general.php
The Blue Pond does not have living organisms inside of it. There are no fish or algae inside. It might be due to the fact that it is not a natural pool but overtime algae should have developed. The pH of the pond cannot be found. After researching reasons for pollution such as factories, all I could find was farming sites and a cheese factory. The farming sites could have polluted the pond but the usual signs are eutrophication and there are no signs of over fertilization of the site. Looking at the pictures, it seems like there might be some signs of sediment pollution as the borders of the pond are a reddish color. However that might just be clay and the way the photograph was taken.
The Blue Pond is certainly ethereally beautiful and attracts lots of tourist which is beneficent to the Japanese economy. It also is a small water space without a lot of current. The lack of aquatic movement could explain the higher concentration of aluminum hydroxide. My reasoning is that it just accumulates and does not evaporate. While I could not prove that the Blue Pond is polluted, it is not a natural watercourse and the colors cannot be explained.



  1. andrewwingfield · November 11, 2015

    This is quite a mystery. I just googled it and I see why it sparked your curiosity. I kind of share your sense that anything that looks so eerily beautiful is probably polluted and dangerous. Do they let people swim in it?


    • cbagmu · November 11, 2015

      They do not allow it because of the risk of renal failure and lung inflammation. Also, it is considered a national land so it’s illegal.


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