Yellowstone National Park - Steve Bumbaugh
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Sour Lake

Sour Lake

According to Montana State University:
Sour Lake, named for its acidic or "sour" water, may look like a pleasant swimming hole, but its water would burn your skin like battery acid. Most of its acid comes from microorganisms that create sulfuric acid as they consume sulfur. These microorganisms also give the lake its color. The smell, color and acidity didn't seem to both the herd of bison who proceeded to drink from it.

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