The Emperor Spring, located in Soos is cold, moderately mineralized ferric sulphate-carbonate-sodium chloride mineral waters with high content of arsenic and beryllium. The temperature in the well fluctuates with the seasons between 14-18 ° C. According to an elevated temperature for the thermal water from the deep subsoil, which extends along a fault and trail mix with cold acidulous water in the Tertiary basin fill. Source is the hottest natural springs forth in Cheb basin. Soos, Czech republic.