Sabalan Hydrotherapy Complex in Sarein is one of the unique water treatment complexes in the Middle East and Asia. The complex was built in an area with 2.5 hectares in 1996. This complex is constructed of two floors, which the first floor is allocated to men and second floors to women. The water of this natural hot spring includes various types of minerals, such as calcium and sodium bicarbonate, and when you are soaked in these minerals, your hydrostatic pressure rises. It can also help you with your muscle pain and skin problems.