The toughest rafting section of the Una River starts with a big splash descending the lower section of this dramatic double waterfall. YouTube videos show daredevils diving off the 18m higher falls but such antics reputedly resulted in hospitalisations and are by no means recommended. The photogenic falls are within the Una National Park and well worth visiting whether or not you're afloat. A series of walkways has been recently constructed to make viewing easier.
The easiest access is 8km along a recently re-graded unpaved road from Orašac (on the Kulen Vakuf road via the national park's Gate 3). Alternatively, in dry conditions you can approach from isolated Gate 1 (Gorevac, 200m off the Bihać–Sarajevo road, 16km from Bihać), but that 14km of woodland lane is very narrow and somewhat rocky (keep right then left at the only two turns en route). If you don't have your own vehicle, it's possible to arrange a minibus ride through the national park office in Bihać (per person 4KM), but that assumes getting 17 people together.