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Death Valley NP, Nevada
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The Devils Hole pupfish, found only in this isolated water-filled cavern, is one of the rarest fish species in the world.
The water-filled cavern of Devils Hole is over 500 feet deep, with its exact depth still unknown due to its complex underwater cave system.
Earthquakes from as far away as Japan have caused water to slosh in Devils Hole, demonstrating its sensitivity to seismic waves.
Devils Hole was the center of a landmark Supreme Court case in 1976, which upheld federal protection for the pupfish and its habitat.
Devils Hole is located within the boundaries of Death Valley National Park, though it is geographically separated from the main park area.
The water in Devils Hole maintains a constant temperature of around 93°F (34°C), providing a stable environment for the pupfish.
Researchers have studied the unique ecosystem of Devils Hole for over 50 years, focusing on the adaptation and survival of the pupfish.
