Yellowstone: Top Photos

The caldera that powers half the world's geysers

Great blue heron (Ardea herodias) on the banks of Firehole River in Yellowstone National Park, USA
Great blue heron (Ardea herodias) on the banks of Firehole River in Yellowstone National Park, USA © Thomas Wolf, www.foto-tw.de, CC BY-SA 3.0, via Wikimedia Commons

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