Krka National Park protects seventeen kilometers of the Krka River canyon, where calcium carbonate deposits have built seven major waterfalls over twelve thousand years. Skradinski Buk, the lowest and widest cascade, drops forty-five meters across seventeen natural steps, creating a thundering amphitheater of moss-covered travertine. The park was established in 1985 to halt limestone quarrying and preserve a landscape that had remained largely unchanged since medieval times, when Franciscan monks built Visovac Island monastery on a mid-river outcrop. Today the site receives over a million annual visitors, most arriving via the historic town of Skradin, where traditional wooden boats ferry passengers upstream through reed-lined channels. The journey reveals why this river corridor mattered to successive powers. Roman engineers diverted water for mills. Venetian governors planted vineyards on the canyon rim. Ottoman forces built fortifications overlooking the rapids. Croatian hydroelectric pioneers installed the world's second alternating-current power plant here in 1895, two days after Niagara Falls, using Krka's flow to illuminate Šibenik's streetlamps fifty-two years before rural electrification reached most of Europe. The park's biodiversity reflects its geographic position where Mediterranean scrubland meets continental beech forest. Eighteen endemic fish species inhabit the river's cooler stretches. Golden eagles nest on canyon walls above dense stands of Dalmatian black pine. The travertine barriers themselves are living structures: cyanobacteria and mosses capture calcium from the water, adding millimeters of stone each year, while the current carves new channels through older deposits. This dynamic geology makes Krka fundamentally different from static limestone caves; the waterfalls you see today will have a different profile in a century. Beyond Skradinski Buk, wooden boardwalks trace the river's edge past abandoned watermills, their grinding stones still visible beneath the flow. Ethnographic exhibits inside restored mill buildings display the tools and contracts that governed this pre-industrial economy. The upper canyon, less visited, contains Roški Slap waterfall and the fortified Krka Monastery, built in 1345 as an Orthodox retreat and later absorbed into Catholic administration. These layered histories make the park more than a natural monument; it is a record of how communities have shaped and been shaped by a single river for two millennia.