Mitchell Falls, also known as Punamii-Uunpuu, is a four-tiered cascade waterfall set within the remote Mitchell River National Park in the Kimberley region of Western Australia.

The falls drop over layers of King Leopold sandstone, carving gullies and cliffs across the Mitchell Plateau.

The Wunambal Gaambera people are the traditional owners of this land, which they have inhabited for over 40,000 years, and the site holds deep spiritual and cultural significance. The falls can be reached on foot via a moderate-to-difficult 8.

6 km round trip beginning at Mertens Creek, passing Little Mertens Falls and the dramatic Big Mertens Falls along the way. Allow four to six hours for the hike. Scenic flights from the campground offer an aerial perspective.

Swimming below the falls is not permitted due to the presence of saltwater crocodiles. The best time to visit is during the early dry season, roughly May through July, when water flow is strongest. The falls are inaccessible during the wet season.