Sareyn is a small spa town in northwest Iran, about 29 km west of Ardabil. It sits at altitude in the Alborz foothills and is best known for its hot mineral springs, which draw visitors from across the region for hydrotherapy and relaxation.
Nine springs with different mineral compositions feed the town's bath complexes. The waters are reputed to have medicinal properties, and weekends fill up with families from Ardabil and Tabriz looking for a restorative break. Sabalan Spring is the busiest, while Gavmish Goli is the oldest and the most sulphurous. Behind the town, Mount Sabalan — Iran's third-highest peak — provides both the geothermal plumbing and a fine summer hiking destination.