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 .
Tahquamenon River
The river is best known for the Tahquamenon Falls, a succession of two waterfalls in Tahquamenon Falls State Park totalling approximately in height. Because the headwaters of the river are located in a boreal wetland that is rich in cedar, spruce and hemlock trees, the river's waters carry a significant amount of tannin in solution (i.e., it is a blackwater river), and are often brown or golden-brown in color. The Tahquamenon Falls are thus acclaimed as being the largest naturally dyed or colored waterfall in the United States. The state park preserves the falls area and some of the river.