![Beautiful blue mountain lake. The Blue Colour is caused by former limestone mining. (Blauer See, Rübeland, Hüttenrode near Blankenburg, National Park Harz in Germany Stock Photo - Alamy Beautiful blue mountain lake. The Blue Colour is caused by former limestone mining. (Blauer See, Rübeland, Hüttenrode near Blankenburg, National Park Harz in Germany Stock Photo - Alamy](https://c8.alamy.com/comp/P26BT7/beautiful-blue-mountain-lake-the-blue-colour-is-caused-by-former-limestone-mining-blauer-see-rbeland-httenrode-near-blankenburg-national-park-harz-in-germany-P26BT7.jpg)
Beautiful blue mountain lake. The Blue Colour is caused by former limestone mining. (Blauer See, Rübeland, Hüttenrode near Blankenburg, National Park Harz in Germany Stock Photo - Alamy
![The lake "Blauer See" in the Harz mountains, Germany, near city of Rübeland, 07. May 2018. Photo: Frank May | usage worldwide Stock Photo - Alamy The lake "Blauer See" in the Harz mountains, Germany, near city of Rübeland, 07. May 2018. Photo: Frank May | usage worldwide Stock Photo - Alamy](https://c8.alamy.com/comp/MM09AR/the-lake-blauer-see-in-the-harz-mountains-germany-near-city-of-rbeland-07-may-2018-photo-frank-may-usage-worldwide-MM09AR.jpg)
The lake "Blauer See" in the Harz mountains, Germany, near city of Rübeland, 07. May 2018. Photo: Frank May | usage worldwide Stock Photo - Alamy
![Strandbad Blauer See | Badeseen | Bäderführer | Sport | Freizeit & Sport | Kultur & Freizeit | Hannover.de | Home - hannover.de Strandbad Blauer See | Badeseen | Bäderführer | Sport | Freizeit & Sport | Kultur & Freizeit | Hannover.de | Home - hannover.de](https://www.hannover.de/var/storage/images/media/01-data-neu/bilder/hmtg/kommunen/garbsen/grafiken/beachbar-blauer-see/19879946-1-ger-DE/Beachbar-Blauer-See_alias_300xVariabel.jpg)