Štrbački Buk: The Una's Great Cascade and How to Reach It

Štrbački buk is the highest and most spectacular waterfall of Una National Park, formed where tectonic movement and travertine deposits built a broad, stepped barrier across the river. It is not a single plunge: the Una spreads across a shelf of rock, splits into several curtains, gathers itself in churning pools and steps down again — a profile that reads as two or three big falls stacked end to end. The river sits at about 294 metres above sea level here, cutting between forested limestone slopes at the eastern edge of Lika-Senj county.

The border matters. Croatia and Bosnia and Herzegovina meet in the middle of the Una at this point, so the fall has two faces: the Croatian bank in the Municipality of Donji Lapac — rough rock terraces, free and unregulated — and the left bank inside Una National Park, where the BiH park authority has built the walkways, staircases and a restaurant. Croatian sources list the fall as a protected geomorphological monument, and the two countries have jointly promoted the Štrbački buk and Martin Brod complex for a UNESCO tentative listing.

From Plitvice count roughly 1 hour 15 minutes: south on the D1 to the Udbina turn-off, east across the Krbava field on the county road to Donji Lapac, then the local road toward the falls past Kestenovac and Gornji Štrbci. From Udbina the run is shorter — about 45 minutes — and from Gospić the D25/county-road combination adds time but works as a loop. Fuel up in Udbina or at Plitvice; there is no petrol station near the falls.

The last eight kilometres narrow to single-track asphalt with gravel patches and few passing places. Drive slowly, expect oncoming traffic at blind bends, and park where the track ends at the top of the bank — the walk down to the terraces takes minutes, not hours. In winter the same road carries ice and the terraces turn slippery; spring and early summer show the fall at full volume, and by late August the curtains thin but never disappear. There is no shop, café or toilet on the Croatian side — carry water and everything else you need.

• From Plitvice: ~1 h 15 via the D1, Udbina and Donji Lapac.
• From Udbina: ~45 min on the county road east.
• Last 8 km: narrow single-track surface — slow down, use passing places.
• No services at the falls: water, food and fuel come with you.

The upper terrace sits at the top of the barrier where the river begins to break apart — the place to read the whole staircase in one frame and the safest spot for anyone unsteady on rock. The main deck lies below the final curtain, close enough that spray carries on spring afternoons; footing is rock and packed earth, and shoes with grip matter. Photographers get the broad side-on views from the Croatian bank in the morning and the deep emerald pools in the late light.

Swimming is the point on this river: below the barriers the Una slows into channels and pools, and because the Croatian bank is not a national park, bathing is lawful here — the contrast with Plitvice and Krka, where swimming is banned, is exactly why river fans drive out. Enter where the flow is visibly slack, mind the suction below the curtains, and keep children above the waterline on the terraces. The emergency number across Croatia is 112, but coverage in the canyon is patchy — treat the site as self-reliant.

• Shoes with grip for the rock terraces.
• Water, food and fuel — no services on the Croatian side.
• Towel and dry bag if swimming; the channels below the barriers are the lawful spots.
• Border discipline: the river line is the state line.