Medveščak (pronounced [medʋeʃtʃǎːk], also called Crikvenik) is a creek in central Zagreb, Croatia. It flows from Kraljičin zdenac in Podsljeme down along the southern slopes of the Medvednica mountain to the Manduševac Fountain, its mouth. The creek was covered in 1898 and today forms part of the Zagreb sewer system. Medveščak has long served as an important geographical feature of historic Zagreb, delineating the border between the often warring twin cities of Gradec (Gornji Grad) and Kaptol between the 11th and the 19th century and causing many violent floods which often decimated houses on its banks.