Stock Photo - 26 June 2023, Baden-Württemberg, Blaubeuren: View of the Blautopf in Blaubeuren. From the Blautopf rises the small river Blau, which flows into the Danube after about 20 kilometers. The bluish color is caused by light scattering from the lime particles in the water, which thus appears to glow blue. Photo: Frank Rumpenhorst/dpa. - Blaubeuren/Baden-Württemberg/Germany

Stock Photo: 26 June 2023, Baden-Württemberg, Blaubeuren: View of the Blautopf in Blaubeuren. From the Blautopf rises the small river Blau.

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