Springs are characterized by high discharge oscillations, many of them drying up during dry periods. Great number of springs is used for water supply of adjacent settlements. Many river courses sink on the contact with limestones, reappearing again on the surface in the form of karst springs. The underground water connections identified so far, confirm the presence of well developed hydrological systems in the karst of Serbia. In the surface morphology of Serbian karst, dolines and uvalas abound.
Microkarstic features occur only sporadically, and poljes are rare.
Dolines are of various forms and dimensions. Usually they are filled with residual material, rarely are they rocky. At some areas swallow holes are very numerous. Amongst larger karst features, uvalas are the most numerous. Originated by karstification of valleys in karst, uvalas are elongated and follow ancient valley direction.