The River Mreznica (64 km) is a watercourse in the region of Central Croatia. In the valley of the Mreznica, the forms of the relief created by erosion and deposits present an important basis for tourism development. This paper explores their appeal (attractiveness). In terms of tourism, about 10 per cent of the direct resources have already been valorised, while the remaining resources represent potential tourist attractions. The real tourist attractions are located in the lower valley, whereas the potential attractions are found in the middle and upper river valley. Access to potential attractions and their valorisation in tourism is impeded by the spreading of the underbrush, which has advanced considerably over the past twenty years, and by the fact that the upper valley is located in the zone of the “Eugen Kvaternik” Military Polygon. Travertine barriers, which have created a specific type of waterfalls and cascades, together with mills, bridges and ferries, characterise the tourist attractions in the valley of the River Mreznica.