Františkovy Lázně is the smallest of the historical spa triangle of West Bohemia. The spa is situated 445 metres above sea level and it boasts unique mineral springs with a high content of carbon dioxide, sulphuric ferric peat bogs and natural seepage of carbon dioxide.
The entire town has very pure air, and its parks and woods are bursting with green.
The local natural mineral water has a relatively high content of dissolved carbon dioxide. Its content oscillates depending on the source, the time of year and other influences.
The water temperature of individual springs ranges between 9° C- 14°C. The average content of carbon dioxide at the outlet of the springs is about 1.5 to 2.5 g per litre, i.e. to 1 litres of gas carbon dioxide dissolved in one litre of water.