Skradinski buk is the longest and most visited waterfall on the Krka River, and one of the best known natural features in Croatia. Skradinski buk is the longest and most visited waterfall on the Krka River, and one of the best known natural features in Croatia. The waters of the Krka and Čikola Rivers meet here and together spill over the 17 cascades over a span of 800 m. Viewing areas have been set up at the most attractive sightseeing spots. These cascades are formed by travertine barriers, islands and lakes, making this one of the most unusual and loveliest landscapes in the park. The travertine cascades of the Krka River are very fragile and sensitive to natural changes and all human activities.Visitors can view the cascades on a leisurely and safe walk along the walking trails and wooden bridges, while abiding by the rules of conduct in the national park. Swimming is permitted at Skradinski buk. Visitors can also visit the old water mills, the ethnography collection, the souvenir shop, or find refreshment in one of the hospitality facilities.