Kayaking Mreznica River (upper section) with waterfalls starting from Slunj

Tucked away in a remote, forested area between Rastoke Village and Plitvice Lakes National Park lies the stunning Mreznica River. Known for its emerald waters, cascading waterfalls, and unspoiled wilderness, this protected natural monument offers a kayaking experience unlike any other in Croatia. Accessible only by kayak, the upper section of the river is a hidden gem, winding through a lush canyon home to brown trout, beavers, turtles, and a variety of bird species. Just 12 km (7.5 mi) from civilization, the river’s pristine source provides fresh, drinkable water. Locals affectionately call it “The Waterfall Playground”.

Your adventure begins in the small village of Primislje, far from the buzz of tourist hubs and unreachable by public transport. Upon arrival, you’ll be welcomed at the Plitvice Outdoor base, set in a sunny clearing surrounded by forest and hills.

After check-in, your guide will provide all the necessary equipment including a tandem sit-on-top inflatable kayak, paddles, buoyancy aid, helmet, and depending on the season, a wetsuit, splash jacket, and water shoes. You’ll also receive a waterproof container to keep your personal items safe and dry on the water.

Before setting off, there will be a detailed safety and paddling briefing. Whether you're a first-timer or a seasoned adventurer, your guide will ensure you're well-prepared and confident for the trip. Solo travellers are welcome and may be paired with another participant or a guide, making this a great opportunity to meet fellow adventurers.

Once on the river, you’ll spend around 2 to 3 hours paddling through tranquil stretches and gentle rapids. The route includes 10 waterfalls, most of which you’ll glide over with your guide's assistance. There are several opportunities for swimming and, for the brave, optional cliff jumps ranging from 1 to 8 metres high. At one of the waterfalls, you can even swim behind the cascading water.

From July to September, water temperatures range between 17°C and 25°C (63°F to 77°F), while springtime from April to July offers a refreshing 14°C to 20°C (57°F to 68°F). Even if you take an unexpected dip, you'll land in a gentle natural pool with no strong currents, and your guide is never far behind to lend a steady hand.

Throughout the trip, you’ll be immersed in breathtaking scenery and the peaceful sounds of nature. For those wishing to capture the moment, a waterproof barrel is provided for your phone or camera, and GoPro rentals or professional photography services are available upon request.

At the end of the kayaking route, a shuttle will be ready to whisk you back to base. Be sure to bring a towel and a change of clothes, as they'll be waiting for you post-adventure. Once you're back, take your time to unwind: change into something dry, grab a refreshing drink, and enjoy swapping stories with your fellow paddlers.

The base is in a very remote area, 15 to 30 minutes driving to town so the guides will be happy to recommend the best restaurants around serving local food. Parking is available at the base, which also serves as a local hangout with options for table tennis, football, or just relaxing in the shade.

Please note that as of March 2025, the local public institution Natura Viva prohibits picnicking and bringing beverages along the river.

No previous kayaking or swimming experience is required. All participants must wear a life jacket and guides will assist throughout the journey. A moderate level of fitness and a spirit of adventure are all you need. 

It is recommended to wear a swimsuit or synthetic shorts underneath quick-drying clothes made of lightweight synthetic fabric, which will stay comfortable when wet. Footwear must be secure: closed-toe water shoes or strapped sandals are required, as flip-flops are not allowed. For your top, a polyester or other fast-drying T-shirt works best, and long sleeves are a great option for sun protection.

This is a unique opportunity to discover one of Croatia’s most beautiful natural wonders in a sustainable and thrilling way. Don't wait and embark on a kayaking excursion on the upper section of the Mreznica River departing from Slunj, Croatia!