İhlas Kuzuluk Termal Hotel, in Kuzuluk, Sakarya province, taps thermal water at 40°C. Its wellness offer includes an indoor pool, sauna, massage and hammam.
Insider tip — İhlas Kuzuluk Termal Hotel stands in the Kuzuluk thermal zone of Sakarya Province, northwest Turkey, one of the country's oldest recognized hot-spring areas. The hotel's indoor pools circulate naturally warm water at 40°C with low mineral content suitable for sensitive skin. Its position at the foot of the Bolu mountains makes it a convenient thermal escape from Istanbul.