Sultanköy Kaplıcaları

Sultanköy Kaplıcaları are traditional thermal baths in Sultanköy village in Sakarya Province, northwestern Turkey, near Sapanca Lake in a landscape of forested hills and river valleys close to the Marmara coast where oligomineral geothermal waters from the North Anatolian Fault Zone — one of the world's most seismically active geological structures — emerge through deep fractures in the crystalline basement rock. The North Anatolian Fault, running across northern Turkey from east to west and responsible for the devastating 1999 Izmit earthquake that killed over 17,000 people, also produces the geothermal activity that feeds thermal springs throughout the Marmara region, transforming tectonic energy into therapeutic warmth. The forested Sakarya province, with its lakes, rivers, and traditional village culture, provides a natural and peaceful setting for the thermal bathing tradition of Sultanköy, where the geology of an active fault zone becomes a source of warmth rather than hazard.