The Karst is the land between the Trieste Bay and the Vipavska Valley and at the same time it is also the name for all the amazing shapes created by waters in the fusible stone. Picturesque karst phenomena can be found in almost half of the area of Slovenia. Besides more than eight thousand known karst caves and potholes, there are also karst springs and intermittent springs, disappearing lakes, swallets and swallow holes, original karst poljes and apparently dry sinkholes.