A Renaissance-era fortress town 55 km south of Zagreb built in the 16th century as a star-shaped defensive stronghold against Ottoman expansion — its original hexagonal plan is still clearly visible from the air. Karlovac sits at the confluence of four rivers (the Kupa, Korana, Mrežnica, and Dobra), and its riverside beaches are the nearest swimming spots to the Croatian capital, earning the city the nickname 'the city of four rivers.' The town's beautifully preserved Baroque old town, the Karlovac City Museum housed in a star fortress, and the nearby Mrežnica river make it an underrated gem of central Croatia.
A Renaissance-era fortress town 55 km south of Zagreb built in the 16th century as a star-shaped defensive stronghold against Ottoman expansion — its original hexagonal plan is still clearly visible from the air. Karlovac sits at the confluence of four rivers (the Kupa, Korana, Mrežnica, and Dobra), and its riverside beaches are the nearest swimming spots to the Croatian capital, earning the city the nickname 'the city of four rivers.' The town's beautifully preserved Baroque old town, the Karlovac City Museum housed in a star fortress, and the nearby Mrežnica river make it an underrated gem of central Croatia. Karlovac is located in Central Croatia, Croatia at coordinates 45.4929, 15.5508. Type: City. Best months to visit: plan ahead for peak season July–August when accommodation books up fast. Find real-time weather forecasts, crowd level predictions, and visitor tips for Karlovac on this page.

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