Iwonicz-Zdrój ([iˈvɔɲit͡ʂ ˈzdruj]) is a spa town in south-eastern Poland, in Subcarpathian Voivodship, in Krosno County. It has 1,831 inhabitants (02.06.2009). It is located in the heartland of the Doły (Pits), and its average altitude is 410 metres (1,350 ft) above sea level, although there are some hills located within the confines of the town. It is one of the oldest health resorts in Poland.