The region is a part of the Dinaric Alps, linked to a Late Jurassic to recent times fold and thrust belt, itself part of the Alpine orogeny, extending southeast from the southern Alps. The Dinaric Alps in Croatia encompass the entire Gorski Kotar and Lika regions, as well as considerable parts of Dalmatia, with their northeastern edge running from Žumberak to the Banovina region, along the Sava River, and their westernmost landforms being Ćićarija and Učka mountains in Istria. The Mountainous Croatia contains five out of eight mountains in Croatia higher than : Velebit, Plješivica, Velika Kapela, Risnjak and Snježnik. Karst topography makes up about half of Croatia and is especially prominent in the Dinaric Alps and in turn, the Mountainous Croatia. There are numerous caves in the Mountainous Croatia. The longest cave in Croatia and in the entire Dinaric Alps, Kita Gaćešina, is located in southern Velebit area of the Mountainous Croatia.