Rafting the Una River: What You Need to Know

The Una River offers adventure-seekers a rare combo of nonstop whitewater and wild scenery. In its upper canyon below the Štrbački Buk waterfall you’ll encounter “thrilling class III whitewater rapids, crystal-clear waters, and untouched nature”. Unlike busy tourist rivers, here only forested canyon walls and emerald pools surround you – the water is even famous for its purity. Divers have found giant trout and 25 kg huchen salmon in Una’s depths, living proof that this is often called “Europe’s cleanest river.” Best of all for Croatia travelers, the main rafting stretch starts in Nebljusi (near Plitvice), so no border crossing is needed. Legend even says “Una” comes from the Latin for “the one” – perhaps fitting for such a uniquely wild river.

Routes and Difficulty Levels

Una rafting is split into a few main sections with varying challenge:

1. Strbački Buk → Loskun (Croatia day trip) – About 7 km from the base of Strbački Buk, taking ~2-3 hours. This run is almost all rapids (Class III on average) with few flat spots. It’s non-stop action, mixing waterfalls, waves and natural pools. This section is family-friendly (min. age ~12) and, meeting at Nebljusi, involves no border formalities.
2. Strbački Buk → Lohovo (Bosnia National Park) – The classic Una adventure: 15 km, ~4 hours. In this full run, the first 10 km are the wildest. In high water (spring snowmelt) the river reaches Class IV-V difficulty, with huge waves and powerful drops. After the breakwater at Lohovo it mellows to Class II-III rapids. This trip is very scenic (through Una National Park) but only for experienced paddlers. (Children under ~16 are generally not taken on the big runs.)
3. Kostela → Grmuša (Bosnia) – A lower 13 km section (2.5-3 h). Rapids here are easier (Class II-III), with small waterfalls and quick pools. It’s ideal for beginners, families or those wishing a milder rafting introduction (this stretch is open to kids ~7+ with guides).
   

   

   
   Spectacular Scenery and Wildlife

   Rafters often laugh out loud as their boat plunges through screaming waves and waterfalls. The surrounding scenery is jaw-dropping: steep limestone cliffs, travertine pools and lush forest line the banks. The Una’s water is perpetually clear (about 13-17 °C), so you can sometimes see riverbed rocks or fish beneath you. Wildlife is plentiful – eagles might swoop overhead, and deer can often be spotted on shore. (Even cave divers describe the Una as a “primeval beauty,” noting emerald waters and “Europe’s cleanest river” teeming with trout and Hucho salmon.) The river cuts through travertine terraces, so each rapid often ends in a glassy green pool – great for snapping photos or taking a quick swim break.

   

   Seasonal Considerations

   • April-May (Spring high water) – Snowmelt swells the Una, making rapids big and wild. Officially the river jumps to Class IV-V. Only do this in full-groups with expert guides.
   • June-August (Summer) – Flows mellow; most rapids sit around Class II-III. Water is cold but bearable (14–16 °C) and the sun is strong. These months offer long daylight and warm air – perfect for refreshing swims between rapids.
   • September-October (Fall) – Flows are similar to summer. Cooler air and changing foliage make the gorge extra pretty. Crowds thin out, but shops or guesthouses in Bosnia may start to close after September. Rafting remains available if rain hasn’t raised the water too high.

   
   Safety and Preparation

   • Guides Only: The Una’s protection rules require all rafting to be with licensed guides. Solo or unsupervised trips are forbidden (and fines can apply) to protect both people and the fragile travertine riverbed.
   • Essential Gear: Tours supply a sturdy raft, helmet, life-jacket and paddle. Many outfits (like Raftrek) also provide wetsuits or dry jackets if the water is cold.
   • What to Bring: Swimwear under your gear, quick-dry clothing, and a change of clothes. Be sure to pack a rash guard or t-shirt under the lifejacket, secure water shoes (no flip-flops), and a towel. Also, bring sunscreen (even on cloudy days) and a small snack or water bottle.
   • Listen to Your Guide: Pay close attention to instructions on paddling and hiking out of the raft if you end up in the water. Always keep your helmet and vest fastened – removing them or horsing around is prohibited. If you capsize, stay calm: let the guide know you’re okay and get back on the raft as instructed.
   • Kids and Health: Minimum age is ~12 on the Croatia trip (younger kids can do the easy Bosnia section with a qualified guide). The cold water and strong currents mean you should be reasonably fit. Anyone with serious back or heart issues should skip this activity.

   Tips for an Unforgettable Trip

   • Stay Hydrated: Pack a full water bottle (and a light snack). You’ll burn a lot of energy paddling, and guides will often pause for a short break or swim.
   • Have an eSIM Plan: Coverage along the Una can get patchy in the canyons, but having a reliable eSIM ensures you stay connected for navigation, sharing photos, or contacting your guide if plans shift. It’s a hassle-free option compared to juggling physical SIM cards, especially for international travelers.
   • Sun Protection: Even if it’s not scorching, the UV can be strong near the river. Apply waterproof sunscreen before and during the trip, and wear sunglasses with a strap.
   • Camera Ready: If you want photos, use a waterproof camera or case. Smartphones should stay in dry-bags on the boat.
   • Booking: In summer 2025, tours fill fast. Book at least a few days ahead if possible.
   • Respect the River: Leave the travertine (tufa) intact and do not litter. The park forbids swimming or rafting outside guided trips to protect the river’s ecosystem. Always follow your guide’s path and instructions – it keeps you safe and preserves the natural beauty for everyone.
   • Paddling the Una is a highlight for many adventure travelers. By combining thrilling rapids with a canyon so beautiful it feels untamed, it truly lives up to its legend as “the One.” With the right preparation and a great guide you’re in for a day of adrenaline and awe far from the usual tourist trail.

     
     Author’s bio. Jim Smith is a travel blogger who loves exploring new places and sharing his experiences. He has journeyed through cities, mountains, beaches, and small towns, always searching for unique adventures and authentic culture. Through his writing, Jim hopes to inspire others to see the world with curiosity and excitement, making travel easier, more enjoyable, and more meaningful for everyone.