Oloʻupena Falls
Oloupena Falls is a waterfall located in the north-eastern part of Hawaiian Island of Molokai, and at is unofficially cited as the fourth highest waterfall in the world, and the highest in the United States.
The falls occur where a short, seasonal stream spills over the edge of one of the tallest sea-side cliffs of the world, located between the Pelekunu and Wailau valleys. They have eroded a groove in the cliff-face and can be observed only from the ocean or air.