Skradinski Buk drops forty-five metres across seventeen travertine barriers in a span of eight hundred metres, each cascade sculpted by calcium carbonate deposits that accumulate at a rate of one centimetre per year. The formations at Krka National Park began accumulating ten thousand years ago, when the river carved through Dinaric limestone and dissolved minerals began precipitating into the terraced pools and moss-covered barriers visible today. Unlike most protected waterfalls in Europe, Skradinski Buk permitted swimming until 2021, and the legacy of that access still shapes how visitors experience the site—boardwalks wind close enough to the cascades that mist reaches the walkways during high-flow months. Krka's travertine system ranks among the most active in the Mediterranean basin. The park protects seven major waterfalls along the river's seventy-three-kilometre course, but Skradinski Buk remains the most visited, drawing over eight hundred thousand people annually. Half day Krka waterfall tour itineraries centre on this section because it concentrates the park's key features—mill ruins, botanical trails, and the widest cascade curtain—within a two-kilometre walking loop. The Franciscan monastery on Visovac Island, upstream from Skradinski Buk, holds a sixteenth-century illuminated manuscript and a reliquary containing fragments attributed to the True Cross, though access requires a separate boat transfer not included in standard waterfall tours. The river's flow varies dramatically by season. Spring snowmelt from the Dinaric Alps pushes discharge above fifty cubic metres per second, turning the cascades opaque with sediment and amplifying the roar audible from the park entrance near Lozovac. By August, flow drops to twelve cubic metres per second, revealing individual travertine steps and the submerged wooden posts of Ottoman-era fish traps. The boardwalk circuit was rebuilt in 2018 using chestnut timber resistant to constant humidity, replacing an earlier concrete path that accelerated erosion along the riverbank. Boat access from Skradin, the coastal gateway five kilometres downstream, adds a thirty-minute approach through the drowned river canyon that forms the park's southern boundary. Electric vessels replaced diesel ferries in 2015 to reduce noise pollution affecting the park's nesting population of Eurasian griffon vultures. The departure point at Skradin's stone quay sits fifteen metres below the medieval fortress walls, where Venetian merchants once loaded Dalmatian oak destined for shipyards in the Adriatic. Half day Krka waterfall tour schedules synchronise with these boat intervals, ensuring groups reach Skradinski Buk before midday heat intensifies.