Black Pool is no longer black due to a change in the hot springs temperature, which changed the nature of the microorganisms living in the pool.
Old FaithfulLake Yellowstone
Lodging and Camping in Yellowstone National ParkMonthly Weather DataGeneral Park Information
What to Know Before You GoThe Regions in Yellowstone National ParkVisitor Centers in Yellowstone National Park
Angela Brown Northwest US Travel Guide
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