The drinking fountain is located on the west from the fortress along a path which leads from “Varoš” to the fortress. The entire area around the fountain is, in fact, a small notch between the Greben hill and Klis where large amounts of water spring up and which has always had a sort of sanctuary element (a relief which depicts Illyrian god Silvan that has been preserved in a cliff some 50 meters to the south; according to a legend, there was a monastery here in the Middle Ages).
The fountain has a rectangular ground plan with a cistern for catchment of water in the back part. The front part is open as a veranda and it has an oriental vaulted ceiling. On the veranda there are three simply decorated niches with oriental characteristics where water springs. There is a niche without an inscription above the niches (it seems that the inscription had not been made). Along the lateral sides of the fountain there were also stone benches. It is a so-called mihrab-shaped fountain (a fountain with niches) and it is the only monument of this kind that has been preserved in Croatia. The fountain was constructed in a form of a cistern: it is 5.50 metres long and 4.50 metres wide, with its inner width being 3.50 metres. Origin: the 16th to the 17th century.