Protection zone of the National Park stretches on the western side from the source of the Krka creek and its course to the confluence with the Una on the state border of Bosnia and Herzegovina with Croatia from where park border follows the Una and state border to the town of Martin Brod and confluence with the Unac.
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The most famous waterfalls are those at Martin Brod, where the popular "International Una Regatta" kayaking competition begins, and Štrbački Buk further downstream.
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On the eastern side border of the park goes from the entrance of the Unac River into its canyon, few kilometers downstream from town of Drvar, and follows the Unac and its canyon all the way to the confluence with the Una in town of Martin Brod.
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The Unac River rises beneath Šator mountain, flows through the municipality of Drvar and finally meets Una River in Martin Brod.