Midway Geyser Basin

Grand Prismatic Spring is the largest and one of the most brilliant of Yellowstone's many colorful hot springs. Its massive expanse stretches approximately 61m across. The high temperature of its water - 70C° - ensures that the spring ist often cloaked in stream.

Deep beneath us, magma from an active volcano heats water that rises to the surface through fissures in the rocks. The result is a hot spring that pours almost 500 gallons (1'892 Liter) of hot water each minute into the Firehole River. Minerals dissolved in the hot water are deposited and gradually build the gracefully terraced shoulders of this feature.Read more