Most of the town is located on the right bank of the river. South of the town is the Sĺňava water reservoir created by a dam on the Váh river. The artificial canal Biskupický kanál and the main river branch join in the town. Another short branch of the river (Obtokové rameno) creates the Spa Island. The spa is located on the Spa Island between two branches of the Váh river, at the site of several hot springs with temperatures of 67–69 °C. The water originates in a tectonic break at 2,000 meters depth. The sulfate-carbonate water from the springs is used in pools and tubs. Sulfurous mud extracted from the bed of a side channel of the river is also used for treatment in the form of thermal mud pools with temperature 39 °C and for partial and full body packs. Spring water and mud therapy is complemented by electrotherapy, exercise, massage, medication, and diet.