Yalova Thermal Spas

Yalova Thermal Spas are located approximately 12 kilometers southwest of the city center of Yalova, in the southeastern part of Türkiye’s Marmara Region. The spas are situated within the boundaries of the Termal district, in a forested area covering 3,750 dunams, within a natural, archaeological, and historical protected zone. Designated as a Tourism Center in 1993 under Law No. 2634 on the Promotion of Tourism, this area is a significant destination for both individuals seeking therapeutic treatments and visitors coming for tourism and recreation. The site is regarded as one of the exemplary settlements that enable the development of thermal tourism due to its climate characteristics, natural landscape, water quality, and historical background.

Yalova Thermal Spas (AA)

History

The historical origins of the Yalova Spas extend back to the Hellenistic and Roman periods. During the Roman and Byzantine eras, the region was frequently visited by the public, especially after Istanbul was declared the capital. Its international reputation was enhanced in 1911 when it won the title of “best healing water” at an international competition held in Rome. Following the founding of the Republic of Türkiye, the Yalova Thermal Spas were restructured as part of the modernization initiatives launched by Mustafa Kemal Atatürk in 1929. In line with Atatürk’s vision of Yalova as “the city of the future’s waters,” foundations were laid for modern facilities, and the Yalova Thermal Hotel, opened in 1938, became the first contemporary thermal facility of the Republican era. Mustafa Kemal Atatürk was its first guest.

Natural and Physical Characteristics

The Termal district lies within the morphologically rugged structure of the Armutlu Peninsula and has an elevation ranging between 200 and 700 meters. The area is dissected by deep valleys such as İsmail Creek and Çağlayan Creek. The region is situated on the North Anatolian Fault Zone, a sign of tectonic activity responsible for the formation of the thermal springs. Geologically, the area is represented by Paleozoic schists, crystalline limestones, Eocene sandstones, and Neogene sediments. Quaternary alluviums constitute the youngest geological units. These formations play a key role in giving the thermal waters their rich mineral and therapeutic properties.

Hydrogeochemical Characteristics

The hot spring sources of the Yalova Thermal Spas primarily consist of three main sources: Esas Kaynak, Gözsuyu, and Midesuyu. Their temperatures range between 54°C and 64°C, classifying them as hyperthermal (above 38°C). The pH values range from 7.65 to 7.75, and electrical conductivity (EC) values fall between 1864 and 1877 µmhos/cm. The waters belong to the category of medicinal waters due to their composition rich in sodium, calcium, sulfate, and chloride. Based on these properties, the spas are classified by the International Society of Medical Hydrology (ISMH) as hypotonic and therapeutic.

Analyses conducted according to drinking water standards have determined that the waters contain low levels of heavy metals (iron, manganese, copper, lead) and pollutants (nitrite, nitrate), posing no health risks. The hardness levels range from 36.72 to 38.74 French degrees, placing them in the “hard water” category. The absence of industrial activity and agricultural pollution in the vicinity of the sources contributes to the preservation of water purity.

Thermal Spas, Mide Suyu (AA)

Recreational and Touristic Use

The Yalova Thermal Spas are not only an important center for health tourism but also for recreation and nature-based tourism activities. The region’s landscape, green spaces, walking trails, and forested areas offer visitors opportunities to immerse themselves in nature. Additionally, the environmentally conscious planning and construction of hotels and accommodation facilities support the area’s tourism potential. In the 1930s, the spa area was reorganized according to modern urban planning principles under a master plan prepared by Henri Prost, ensuring structured and planned development.

Thermal Spas, Walking Path (AA)