"Kraljičin zdenac" is one of the strongest springs of Kraljevac stream on Medvednica mountain.The water temperature in the spring is 10°C. It's name (Kraljičin zdenac = Queens well) origins from the legend of Black queen, probably Barbara Celjska, king Sigismund's second wife, who lived in the first half of 15 th century.

http://www.pp-medvednica.hr/Medvednica_en/Medvednica_kultura2_en.htm