If you want to visit Bujanovačka spa it is located near Vranje and Vranjska spa. About 120 km from Niš, in south Serbia. Temperatures of water in there are about 44°C. Especially relevant mud in this spa is of volcanic origin. Therefore is counted as one of the healthiest and best in the world. Especially relevant, this is only spa in the country that use natural carbon dioxide gas in treatment.
Most of all in The Spa are treated rheumatic, conditions after injuries, chronic diseases of the digestive tract. And also skin diseases, gynecological diseases, neurological disorders. Monastery Prohor Pčinjski and town of Vranje, on the photo, are near. It is among youngest spas in the country. Wells of this spa got examined in 20th century. Much as heath treatment of water and mud from this area were known in Roman and Ottoman time.
And also more about town Vranje you can read on this link