Una National Park: Štrbački buk and Martin Brod

A river park in the far northwest, not a Sarajevo day trip

Una National Park protects a stretch of the Una river around Bihać, close to the border with Croatia in the far northwest of Bosnia and Herzegovina. The park’s two headline sites are Štrbački buk, a wide waterfall the river drops over in a single curved shelf, and Martin Brod, a stepped run of smaller cascades and old watermills a little further south. Both sit on turquoise-green water that is cold, fast and, for a few months a year, genuinely raftable.

The honest number to plan around is the distance from Sarajevo: about 300 km and 4 hours 30 minutes by road, one way. That rules out a same-day round trip for anyone who wants more than a couple of hours at the water’s edge after nine hours in a car. Treat Una as either a stop on a longer loop toward Croatia, or as its own short break built around a night or two in Bihać, ideally timed to rafting season between May and September.

Why Una is not Sutjeska with better water

It is worth being clear about what makes this park different from Sutjeska National Park, the other big protected area travellers ask about. Sutjeska sits in the southeast, near Foča, and its identity is vertical: Maglić, the country’s highest peak at 2,386 m, and the primeval forest of Perućica, reached with a mandatory park guide. Una sits in the far northwest, near Bihać, and its identity is horizontal: a river carving gorges and dropping over travertine shelves at a modest altitude, closer to 200–250 m above sea level than to alpine terrain.

Walking distances at Una are short and the paths are easy — this is a park you visit for a waterfall and a swim, not for a multi-day trek. If mountains and forest are what you are after, Sutjeska (or the Bjelašnica and Jahorina highlands close to Sarajevo) fit that brief better. If moving water, canyons and a border-river backdrop are the draw, Una is the one worth the drive.

Getting there from Sarajevo

There is no direct train or fast bus route that makes this an easy public-transport trip. The realistic options are:

Method	Time from Sarajevo	Notes
Car	~4 h 30	Most flexible; needed to reach Štrbački buk and Martin Brod directly
Bus to Bihać	~5–6 h, with a change	Check buses in Bosnia for current carriers and stations
Train	Not practical	The rail network does not serve this corner of the country; see trains in Bosnia

Driving your own route gives the most control, and is the only realistic way to reach both waterfall sites and continue on toward Croatia in the same trip. If you are not driving yourself, see car rental in Sarajevo and driving in Bosnia before booking; road quality is fine on the main routes but mountain sections slow the average speed down.

From Bihać itself, Štrbački buk is around 30 km south, roughly 40 minutes by car on a mix of asphalt and a final gravel stretch. Martin Brod is a further 15 km south of Štrbački buk, on a road that continues to deteriorate the closer you get.

Štrbački buk: the waterfall on the Croatian border

Štrbački buk is the single most photographed spot in the park, and it earns the attention. The Una drops around 24 metres here, not as a narrow chute but as a broad, curved wall of water roughly 120 metres wide, split by wooded islands partway across. The Croatian bank is close enough to see clearly on the far side; this stretch of the Una is the international border, and the far bank belongs to Croatia’s own Una National Park, which mirrors the Bosnian side.

A marked path and wooden boardwalks lead from the car park to several viewpoints, including one close to the base of the falls where the spray reaches the walkway in high water. The walk itself takes 15–20 minutes each way at an easy pace; allow an hour or more if you want to sit by the water. There is a small entrance fee at the kiosk, a car park, and a couple of seasonal food stalls, but no significant infrastructure beyond that — bring water and, in summer, sun protection, since much of the path has little shade.

Flow varies sharply with the season. Spring and early summer bring the fullest, loudest waterfall; by late August the same shelf can be a fraction of the width, with more exposed rock than water. Neither version is wrong, but they are different experiences, so match your expectations to the month you are visiting.

Martin Brod: cascades and watermills

Martin Brod is a different kind of site: instead of one dramatic drop, the Una splits and cascades over a series of smaller travertine steps, weaving between wooded islands and past a scatter of old stone watermills, some restored, most simply left as they are. It reads less like a single monument and more like a working river landscape that happens to be beautiful, with a small settlement, a bridge, and paths that follow the water rather than lead to one viewpoint.

Because the drops here are lower and the water splits into multiple channels, Martin Brod tends to have fewer crowds than Štrbački buk, even in high season. It also has more shaded riverside spots suited to a slow picnic rather than a quick photo stop. Combine the two sites in a single day if you are driving: Štrbački buk in the morning, lunch in Bihać or at Martin Brod, then the cascades and mills in the afternoon before the light softens.

Rafting the Una, May to September

The Una is one of the most consistent rafting rivers in the country, and unlike some seasonal streams it holds a reliable flow through most of the summer thanks to a series of springs feeding the river along its course. The season runs from May to September, with the strongest current in late spring and early summer and calmer, warmer water by August — better suited to families and first-time rafters.

a guided rafting run through Una National Park, launching from Bihać covers the more scenic gorge sections with licensed guides and full safety gear, typically 2–3 hours on the water. A second option, a white-water rafting outing on the Una, runs comparable routes with a different operator, useful if the first is booked out on your dates. Check current departure times and minimum group sizes directly with the operator before travelling, since both run seasonally and schedules shift with water levels.

For context on how the Una compares to the country’s other rafting rivers — the Neretva near Konjic and the Tara reached from Sarajevo — and on what safety gear and experience level each expects, see rafting the Una and the general rafting season and safety guide for Bosnia.

Bihać: the town to base yourself in

Bihać itself is a modest riverside town rather than a tourist set piece, but it is the practical base for the park: it has the region’s hotels, restaurants and the closest supermarkets and pharmacies to both waterfall sites. The Fethija Mosque, a converted 16th-century church with a distinctive rounded form, sits in the old town centre and is worth a short stop. The town beach along the Una, popular with locals in summer, gives a lower-key alternative to the park itself for an easy afternoon swim.

A short drive from Bihać, the town of Cazin makes a worthwhile add-on if you have an extra half-day: a glass mosaic art workshop in Cazin, with house-made tea included is a low-key, hands-on stop that breaks up a trip otherwise built entirely around waterfalls and driving.

Building this into a bigger trip

Given the distance from Sarajevo, Una National Park makes the most sense as part of a larger route rather than an isolated visit. Two patterns work well:

• The Croatia loop: Sarajevo to Bihać, then on to Plitvice Lakes and the Croatian coast or Zagreb, returning to Sarajevo by a different road or flying out from Croatia. This spreads the long drive across a trip you were already planning to make, rather than treating it as dead time.
• The northwest detour: Sarajevo to Banja Luka to Bihać and back, adding the country’s second city to the same trip. a guided walking tour of Banja Luka’s centre and, further out of town, a guided hike with transfers to Krupa na Vrbasu near Banja Luka both fit naturally into this leg, and the Vrbas gorge they cover is a smaller, closer cousin of the Una’s canyon scenery.

If you are without a car and weighing whether this trip is realistic at all, day trips without a car and the broader list of best day trips from Sarajevo are worth checking before you commit — Una will not appear as a same-day option there, and that omission is deliberate rather than an oversight. For route planning across several days, a seven-day Bosnia road trip is the itinerary format that actually accommodates a stop this far from the capital.

Practical details

Distance from Sarajevo	~300 km / ~4 h 30 by car
Base town	Bihać
Štrbački buk from Bihać	~30 km / ~40 min
Martin Brod from Bihać	~45 km / ~1 h
Waterfall height at Štrbački buk	~24 m
Rafting season	May–September
Best rafting flow	Late May–early July
Calmer water for families	August
Entrance	Small fee at kiosks for Štrbački buk and Martin Brod

A note that applies to any walking in this region, not only the marked park paths: mine safety around Bosnia’s hiking trails is a real concern in parts of the countryside away from cleared and marked routes. Within Una National Park itself the visitor paths are established and safe, but do not wander off them into surrounding fields or forest on the assumption that a rural area this scenic is automatically clear.

Una National Park questions answered

Can I visit Una National Park as a day trip from Sarajevo?

Not honestly. Bihać is around 300 km and 4 hours 30 minutes from Sarajevo each way, so a same-day round trip means roughly nine hours of driving for a few hours in the park. Plan at least one night, or fold it into a longer loop toward Croatia.

How tall is Štrbački buk?

Around 24 metres, dropping over a wide, curved shelf of the Una where the river forms the border with Croatia. It is one of the largest waterfalls on any river in Europe by width rather than by height.

What is the difference between Štrbački buk and Martin Brod?

Štrbački buk is a single wide cascade a short walk from a car park. Martin Brod, about 15 km further south, is a series of smaller travertine cascades and old watermills spread along a gentler stretch of the river, closer to a village than a single viewpoint.

When is the rafting season on the Una?

May to September, with June and early July usually giving the strongest flow. Water levels drop through August, which makes the rapids gentler and easier for first-timers and families.

Is Una National Park connected to Sutjeska National Park?

No, they sit at opposite ends of the country and have different terrain. Sutjeska, in the southeast near Foča, is high mountains and old-growth forest around Maglić. Una, in the northwest near Bihać, is river gorges and rapids at a much lower altitude.

Can I combine Una National Park with a trip to Croatia?

Yes, and it is the most sensible way to see it. Bihać sits close to the Croatian border, and Plitvice Lakes National Park is roughly 60 km further on, making a Sarajevo–Bihać–Plitvice–Zagreb or coastal loop a realistic route rather than a backtrack.

Do I need a guide to visit Štrbački buk and Martin Brod?

No, both sites have marked paths, car parks and entrance kiosks, and can be visited independently. A guide matters more for rafting, where a licensed operator provides the raft, safety gear and local knowledge of the rapids.