The city ofKarlovac is a fort from the times of theMilitary Frontier with theOttoman Empire. It was built as a six-side star fort in the 16th century at the point of confluence of four rivers. The town blossomed in the 18th and 19th century after being made a free town, with the development of roads betweenPannonian Basin to theAdriatic Sea, and waterways along theKupa river. The city is making use of its crucial geostrategic point inCroatia.
The county itself extends towards the north to the water springs ofJamnica, and towards the south all the way down to the mountainous regions ofGorski Kotar andLika, in particular to theBjelolasica mountain which features the largestwinter sport recreation center in the country.