description Black Sand Basin Overview
Black Sand Basin is a geothermal area in Yellowstone National Park's Upper Geyser Basin, near Old Faithful in Wyoming. Its name refers to fragments of black volcanic glass, or obsidian, found in the basin. The area contains several hot springs and pools, including Emerald Pool, whose green appearance results from the interaction of water color, reflected light, and heat-tolerant microorganisms. It is part of Yellowstone's concentration of geothermal features.
help Black Sand Basin FAQ
Where is Black Sand Basin in Yellowstone?
Black Sand Basin is in Yellowstone National Park's Upper Geyser Basin in Wyoming. It is located northwest of Old Faithful, making it a practical stop when visiting that area.
What geothermal features can you see at Black Sand Basin?
The basin includes Emerald Pool, Rainbow Pool, Sunset Lake, Opalescent Pool, Cliff Geyser, and Spouter Geyser. Colors vary because of temperature, minerals, and thermophile communities around the pools.
Why is Black Sand Basin called Black Sand Basin?
The name refers to fragments of black volcanic glass, or obsidian, found in the area. The basin is not a beach, but a collection of geothermal pools and geysers.
Can visitors bathe in Black Sand Basin?
No. Yellowstone's hydrothermal features are unsafe for swimming, and visitors must remain on designated boardwalks and trails. Black Sand Pool, for example, has boiling and splashing activity rather than a safe bathing area.
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