Natural Wonders

Sometimes Yellowstone’s geyser and waterfalls overshadow some of the park’s amazing natural wonders. See giant waterfalls, petrified trees, natural rock arches, lava formations, and hoodoos.

Scenic Cruiser on Yellowstone Lake. Photo by NPS

8 Questions About Yellowstone Lake

How big is Yellowstone Lake? How deep is it? Is it natural? and answers to other questions about the largest lake in our America's first national park.

The Yellowstone River above the Upper Falls

The Untamed Yellowstone River

As the only undammed river in the lower 48 states, the Yellowstone River flows 692 miles through Wyoming, Montana and North Dakota.