After looking up the reason it suggest that the water is blue because of the limestone particles found in the water and when it rains it causes the water to get darker because the particles spread out. Thanks for sharing this post with us, I find you pictures to be amazing and I am learning new stuff from your post! thanks!
RE: Discovering the Swabian Jura - Part 4, The Blautopf - Water from under the mountain [Mobile photography]
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Discovering the Swabian Jura - Part 4, The Blautopf - Water from under the mountain [Mobile photography]