The “the great karst phenomena” of the former Venezia Giulia are well known, but little attention has been paid to the numerous forms of fluvial karstic nature scattered in the region of the Inner Notranjska (Slovenia), which are of extraordinary geomorphological interest. The Unica - the watercourse that erupts, sometimes with a roar, from the Planina Cave after meandering lazily on the bottom of the Karst field of the same name, silently disperses its waters underground in an articulated series of sinking areas that are concentrated in correspondence to the “pod Stenami” geotope. The contribution examines the features of the geotope and employs appropriate chorematic models.
