MEINWOMO picture 1689829, The Blautopf - in Blaubeuren are found after Aachtopf the second water-richest karst spring in Germany, which is, however, highly dependent on rainfall.. The blue water coloration varies significantly with the sunlight and is caused by the scattering of light in highly calcareous water.

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The Blautopf - in Blaubeuren are found after Aachtopf the second water-richest karst spring in Germany, which is, however, highly dependent on rainfall.. The blue water coloration varies significantly with the sunlight and is caused by the scattering of light in highly calcareous water.
(mcwomo : 2012)