Among the mineral waters of Transbaikalia, which are diverse in composition, the soda waters of Baley are of particular interest. In hydrogeological terms, the area of Baley can be considered as an intermountain artesian basin composed of Mesozoic and Jurassic sediments, framed by crystalline rocks, stretched almost latitudinally and aligned with the broad tectonic valley of the Unda River. On the northern flank of the basin, within the southern slopes of the Borshchovochny Ridge, the South Borshchovochny hydromineral line can be traced, characterized by outcrops of cold carbon dioxide springs and dry gas jets. These include, for example, the Shurugunsky springs, the spring in the Semenovaya ravine, the Lozhnikovsky, Zhidkinsky, and others. All these springs have a water composition close to that of the Darasun mineral springs. With low mineralization, the predominant components in the water are bicarbonates of magnesium and calcium. This so‑called Darasun type of carbonated mineral waters is extremely widespread in the Daurian hydromineral region.