"Sometimes these smaller eruptions can produce small calderas within Yellowstone caldera," Stelten said. "For example, the West Thumb of Yellowstone Lake is a caldera formed during an eruption ...

If you head south, you’ll be able to take a tour of Lake Yellowstone and see the West Thumb Geyser Basin. If you head north, you’ll be able to explore Hayden Valley and the Mud Volcano area ...

Sitting in the heart of Yellowstone's West Thumb area is Yellowstone Lake, the park's largest body of water and the largest high-elevation lake above 7,000 feet in North America. The lake is 20 ...

Madison and West Yellowstone; Mammoth Hot Springs and the North; Norris Geyser Basin; Old Faithful; Tower-Roosevelt and the Northeast; and West Thumb, Grant, and the South. Montana's North and ...