A Slow Guide to the Mrežnica River: Croatia's Emerald Swimming Paradise

Just an hour from Zagreb and a world away from the crowded coast, the Mrežnica River winds through central Croatia in a series of startlingly green pools and low waterfalls. Unlike the famous Plitvice Lakes or Krka National Park, the Mrežnica remains a quiet, uncommercialised corner of the country, where locals swim, paddle and picnic along its forested banks.

What makes the Mrežnica special?

The river's striking colour comes from its karst geology. Over millennia, mineral-rich water has deposited travertine, a porous limestone that forms natural dams, barriers and terraces. These barriers create dozens of small waterfalls and deep emerald pools, many of which are perfect for bathing. In summer, the water warms to a pleasant temperature, making the Mrežnica a favourite spot for families and wild swimmers.

Where to swim and explore

There are numerous public access points along the river, particularly between the towns of Duga Resa and Generalski Stol. Look for small gravel beaches, river bends and old mill sites where paths lead down to the water. Swimming is allowed in most natural areas outside designated protected zones, but always check local signs. A pair of water shoes is useful because the riverbed can be rocky and uneven.

Kayaking and canoeing

The Mrežnica is ideal for gentle paddling. Its slow current and low waterfalls make it suitable for beginners, and several local villages offer equipment rental and shuttle services. A popular route starts near Generalski Stol and follows the river downstream, passing through quiet countryside, under stone bridges and past abandoned watermills. No experience is necessary for most sections, but a basic level of fitness helps when portaging around the larger barriers.

Riverside walks and viewpoints

If you prefer to stay dry, the quiet country roads and forest paths that parallel the river offer lovely walking. The area is dotted with traditional wooden houses, orchards and hay meadows. For the best views, stop at one of the old stone bridges that cross the river; from here you can see the water slide over the tufa steps in a chain of luminous cascades.

When to go and practical tips

The best months for swimming are from late May to September, when the weather is warm and the water level is lower, exposing more of the travertine pools. Spring and autumn bring higher water and are better for kayaking and photography. The Mrežnica valley remains relatively quiet even in high summer, but weekends can be busier with local visitors. Pack drinking water and snacks, as facilities are limited along the river, and always take your rubbish with you. The river's ecosystem is fragile, so use eco-friendly sunscreen and avoid trampling the delicate travertine formations.