View of the 'Grand Prismatic' hot spring. The Grand Prismatic Spring in Yellowstone National Park is the largest hot spring in the United States, and the third largest in the world, next to those in New Zealand.
Tourist walk beside the partially frozen Yellowstone Lake. The Yellowstone Lake is the largest body of water in National Park and is one of the largest high-altitude lakes in North America.
Approximately 5% of park is covered by water; 15% is grassland; and 80% is forested.
Tourists walk beside a hot spring and the partially frozen Yellowstone Lake. The National Park is a designated World Heritage Site and a designated Biosphere Reserve Site.
View of the partially frozen Yellowstone Lake at the West Thumb Geyser Basin. Yellowstone is one of the world's largest calderas, measuring 55 kms by 72 kms. Yellowstone, like Hawaii, is believed to lie on top of an area called a hotspot where light, hot, molten mantle rock rises towards the surface.
View of the 'Sunset Lake' hot spring with its unique colours caused by brown, orange and yellow algae-like bacteria. Yellowstone National Park spans an area of 8,983 km2, comprising lakes, canyons, rivers and mountain ranges.
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