Beautiful blue mountain lake. The Blue Colour is caused by former limestone mining. (Blauer See, Rübeland, Hüttenrode near Blankenburg, National Park Harz in Germany

- Image ID: P26BNB
Beautiful blue mountain lake. The Blue Colour is caused by former limestone mining. (Blauer See, Rübeland, Hüttenrode near Blankenburg, National Park Harz in Germany
mauritius images GmbH / Alamy Stock Photo
Image ID: P26BNB