Haydar Kaplıcaları, in Simav district, Kütahya province, draws on steam and thermal water of pH 7.3, with covered pools, outdoor pools and a sauna area.
Insider tip — The Haydar hot springs in northern Kütahya, within the broader Simav geothermal zone — one of western Anatolia's most productive geothermal fields. A local mineral spring in a rural area between Simav and Balıkesir provinces.