Due to the volcanic activities that took place 50-20 thousands of years ago, one can find highly mineralized water alongside the Eastern range of the Carpathian Mountains. These sources are used both for internal and external cures, or simply just as drinking water.

According to the different mineralization, you will meet various types of fizzy and still mineral water in Szeklerland: they differ in color (brownish, yellowish, lime white), smell (sulphurous, ferruginous), and taste (ferruginous, salty).

You can find mineral water springs near the roads or close to the forest, as well as bottled as drinking water or curing/medicinal water (Malnaș - Aqua Telluris, Regina - Benkő, Vâlcele); captured in small wooden pools and called traditional Szekler mineral water bath (Apor Bath, Csiszár Bath in Balvanyoș Spa, Uncle Teddy Bear's Bath in Bățanii Mici, Sütei Bath in Olteni, Fortyogó Bath in Peteni, Csókás Bath in Cernat, Bugyogó Bath in Valea Zălanului, Smelley Bath in Belin, or at Ozunca Băi); or used in balneotheraphy in Covasna Spa or other centers (Belin, Hătuica, Olteni, Malnaș-Băi, Vâlcele, Șugaș).