Kamencové jezero (

Alum An alum () is a type of chemical compound, usually a hydrated double salt, double sulfate salt (chemistry), salt of aluminium with the general chemical formula, formula , where is a valence (chemistry), monovalent cation such as potassium or a ...

Lake) is a lake in the municipal area of

Chomutov Chomutov (; german: Komotau) is a city in the Ústí nad Labem Region of the Czech Republic. It has about 46,000 inhabitants. There are almost 80,000 inhabitants in the city's wider metropolitan area. The city centre is well preserved and is protec ...

, Czech Republic. It is artificial in that it came into being due to 18th century mining. Kamencové jezero, at an altitude of , was caused at the end of the 18th century by flooding the mines used between the 16th and 18th centuries. It occupies an area of 15.95 ha and the maximum depth is 3.4 m. The high content (about 1%) of

alum An alum () is a type of chemical compound, usually a hydrated double salt, double sulfate salt (chemistry), salt of aluminium with the general chemical formula, formula , where is a valence (chemistry), monovalent cation such as potassium or a ...

in the water from Alum Lake prevents the lake from the growth of weed and anabaena. For that reason it is very frequently visited in the summer months.

References

Artificial lakes of the Czech Republic Geography of the Ústí nad Labem Region Chomutov {{ÚstíNadLabem-geo-stub