Sabalan is the busiest of Sareyn's nine springs and the one most visitors try first. The bathhouse sits on the central avenue, with separate large pools for men and women fed by water that emerges from the ground at around 46°C. The mineral content — bicarbonates, sulphates, a little iron — gives the water a faint metallic taste and is supposed to be good for rheumatism and skin complaints. Whether that is true or not, the immersion is genuinely relaxing after a cold day in the Alborz.
The complex is open from early morning until late evening and gets busy on Thursday and Friday afternoons when Iranian weekenders arrive. Entry is cheap by international standards. Bring your own towel and a pair of plastic sandals; both are sold near the entrance if you forget.