Falls of the Yellowstone
The Lower Falls of the Yellowstone River thunders over a cliff as seen from almost a mile away. At 309 feet high, this waterfall is nearly twice the height of Niagara Falls. It is the largest waterfall in the Rocky Mountains by volume, although the flow rate was a lot less in September when this was taken. The 24-mile long Grand Canyon of the Yellowstone starts here and in some places is over 1,000 feet deep. The canyon walls consist of a volcanic rock called rhyolite, and display a wide variety of colors. Hot springs and other geothermal features are scattered throughout the canyon along the river. If you look closely you can see a viewing platform just above the falls to the right.