Yellowstone National Park
Yellowstone National Park has one of the world's largest petrified forests, trees which were long ago buried by ash and soil and transformed from wood to mineral materials. This ash and other volcanic debris are believed to have come from the park area itself as the central part of Yellowstone is the massive caldera of a supervolcano. The park contains 290 waterfalls of at least , the highest being the Lower Falls of the Yellowstone River at .
Natural Falls State Park
It includes a waterfall which is tall. This is one of the two tallest known waterfalls in the state, matching Turner Falls in the Arbuckle Mountains. The falls are known to local residents as Dripping Springs Falls, but the State renamed the park as Natural Falls to distinguish it from Dripping Springs State Park and other sites in Oklahoma with similar names.