Virtual Guidebook to Yellowstone and Grand Teton National Parks
The Mud Volcano Area
Yellowstone National Park, Wyoming
Dragon's Mouth Spring. The Mud Volcano, half destroyed by its own eruptions.
Sour Lake, something between a hot spring and a mud pot. The Churning Cauldron, living up to its name.
A new fumarole has appeared in the Mud Volcano parking lot.

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