Krka National Park extends from Šibenik bridge to Knin, centering on a deep canyon and several spectacular waterfalls. The park is well signed, with five entrances. The main entrance, and the most convenient one when arriving from Šibenik, is at Skradin (20km or 13 miles from the city). From here you can take a national park boat up the river, almost to Skradinski Buk, the park’s most impressive falls, which tumble 46m (150 ft.) over a series of 17 cascades. The falls at Krka are similar to those at Plitvice, in that they were formed from deposits of limestone sediment (travertine). From Skradinski Buk, where you can swim, a network of footpaths and wooden bridges lead 10km (6 miles) all the way to another thundering waterfall, Roški slap. Alternatively you can cover this stretch with another ride aboard a national park boat, which stops en-route at the 15th-century Visovac Monastery, perched on a tiny islet.