Northern Rockhole, in Nitmiluk National Park, is a half day walk from the Nitmiluk Centre at the Gorge.
It's a lovely lunch spot on the first day of the iconic Jatbula Trail. You'll climb over dark volcanic rocks to reach the base of the falls, where you can see many layers of sedimentary rocks in the cliff face. A lovely swimming spot, in the early half of the year, is usually a single drop waterfall that you can bathe beneath. As it starts to dry out, the smooth green pool provides unusual 'must see' reflections.