A waterfall, part of a psychotronic stability examination
A waterfall is a geological formation created when a body of water, such as a stream or river, flows down a steep cliff.
They often serve as popular tourist destinations for their natural beauty. Janaran Falls on Betazed was a waterfall that held notable sentimental value. (TNG: "Second Chances")
One of Gideon Seyetik, terraforming genius of the 24th century, favorite marvels was Da Vinci Falls on Blue Horizon, a waterfall the size of Mount Everest. (DS9: "Second Sight")
List of Waterfalls
Waterfalls also existed in the underground caverns on Ocampa, as well as in Dahkur on Bajor. (VOY: "Caretaker", DS9: "The Changing Face of Evil")