Číž Thermal Spa in the village of Číž near Rimavská Sobota, southern Slovakia, draws iodine-rich thermal waters discovered during oil exploration in the 1960s from deep Neogene sedimentary formations beneath the Southern Slovak lowland basin, with iodine concentrations among the highest in Central Europe. The iodine waters are enjoyed within a long thermal tradition associated with well-being, in a spa complex operating since the Communist era and modernized into a contemporary wellness resort. The surrounding southern Slovak lowlands are part of the traditional Hungarian Alföld cultural heartland separated from Hungary by post-WWI borders, where Baroque country churches, vine-growing villages, and Hungarian folk traditions characterize a landscape of peaceful agricultural beauty.
Insider tip — The thermal spa at Ciz near Rimavska Sobota sits in the flat Ipeľ river basin of southern Slovakia on the Hungarian border, tapping into the Pannonian basin aquifer that feeds many of central Europe's best thermal baths. The geothermal water emerges at a steady 40°C and is used in the resort's outdoor pools, which are packed with Slovak and Hungarian visitors in summer. The surrounding Gemer region has an unhurried rural character with medieval churches and cave systems. A short drive south crosses into Hungary's thermal-bath country around Balassagyarmat.