Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Vrnja ka Banja (Serbian cyrillic: ) is a town, municipality, and a resort, mineral spa located in Ra ka District of Serbia. It contains the world''s only hot spring with a temperature measuring exactly that of the human body (36.5 degrees Celsius).Vrnja ka Banja is the most celebrated and most popular spa town of Serbia and at same time, a very attractive recreative centre. Situated in a great park full of trees with particularly charming houses, the town has a promsing future. Surrounding Vrnja ka Banja are UNESCO protected medieval buildings, which serve as a reminder to early European civilisation.