Banja Luka is the second-largest city in Bosnia and Herzegovina and the administrative centre of Republika Srpska, located on the Vrbas River in the north of the country. It is a city that surprises: more relaxed than Sarajevo, greener than expected, and with a riverside character defined by the fast, clear water of the Vrbas flowing through its centre.
The Kastel Fortress overlooks the Vrbas from a rocky promontory — a fortification built on Roman foundations that is now as much a concert venue as a historical monument. The Ferhadija Mosque, a masterpiece of 16th-century Ottoman architecture, was blown up during the 1993 war and rebuilt with painstaking care, reopening in 2016 as both a place of worship and a testament to cultural survival. The Cathedral of Saint Bonaventure stands nearby, completing an unusual trio of religious landmarks within a few minutes' walk of each other.
The Vrbas River promenade is where the city goes to relax, and upstream the river enters a limestone canyon where whitewater rafting is the main outdoor activity. The pedestrian zone on Gospodska Street is the social heart of the city, lined with cafes that fill from morning coffee through to late-night rakija. The Museum of Modern Art and the cultural centre at Banski Dvor complete the cultural picture.
Banja Luka tends to get overlooked by travellers rushing between Sarajevo and the Croatian coast. That is their loss — the city is good value, genuinely pleasant, and a useful gateway to the wider Republika Srpska, including the medieval town of Jajce to the south.