Podunajská nížina lowland - is due to its geological structure rich for significant sources of hot mineral water. The most famous thermal drill is located in Veľký Meder, which erupts 14 liters of water per second with a temperature of  almost hundred degrees of Celsius. This represented an excellent base to build the local thermal baths. There are many similar baths located in this area - Patince, Podhájska, Dunajská Streda, or Štúrovo.