Since ancient times the city is known for its mineral springs. Their number in Sandanski is 11 - 8 are located in the area of the city park, and 3 across the river Sandanska Bistritsa. The water temperature is between 42 and 81 °C. The most famous springs are Periloto, Turkish bath and Miroto, where deposits of mud are found. Water is also used by a number of hotels in the city, by the swimmers boarding school and the sanatorium in which people come from all over Bulgaria for the treatment of lung diseases. Mineral water in the town is clear, colorless and odorless, slightly mineralized. It has positive effect on diseases of the gastrointestinal tract, lungs and liver, kidney, heart and nervous system.