Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park
By Yellowstone Volcano Observatory
2005 (approx.)

Detailed Description
Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park. Grand Prismatic is the largest hot spring in Yellowstone and the third largest in the world. Photograph by Robert Fournier.
Sources/Usage
Public Domain.