<p>Located on the Alpine–Himalayan orogenic belt, Turkey has an outstanding geothermal potential due to</p><p>geothermal systems developed by young tectonic and volcanic activity. In particular, Central Anatolia is Turkey’s</p><p>geopolitical region with the second-greatest potential in terms of geothermal resources. In a contribution to</p><p>hydrogeochemical studies performed in a limited part of Central Anatolia, we designed a study to determine the</p><p>hydrogeological and hydrogeochemical properties of the geothermal fields located in provinces within the region’s</p><p>Konya Plain Project (KOP)-Aksaray, Karaman, Kırıkkale, Kırs¸ehir, Konya, Ni˘gde, Nevs¸ehir and Yozgatwhich</p><p>collectively occupy 12.2% of Turkey’s total area and contain 39 geothermal fields. In the study area,</p><p>geothermal fluids are used for tourism, greenhouse cultivation, city heating and industrial purposes, and the</p><p>outlet temperatures of thermal waters were recorded to range from 21.0 to 105.5 ◦C. In the study area, there are</p><p>four different water types as (i) CaMgHCO3, CaHCO3, (ii) CaNaHCO3Cl, (iii) NaCaClSO4 and (iv) NaCl and</p><p>reservoir rocks were generally Palaeozoic metamorphic (i.e. marble) and/or igneous (i.e. granodiorite, granite</p><p>and rhyolites). Chemical geothermometers (i.e. cation and silica) were used to determine the reservoir temperature</p><p>of the geothermal waters.</p>