The Devil's Hole Pupfish is native to the geothermal water-filled cave in which it lives.  The pool usually stays a very warm 92 degrees F in the limestone cavern.  Of all the pupfish varieties that live in the desert, the ones who live at Devil's Hole are known to be the smallest. Even though Devil's Hole is technically outside of the borders of the park, it was added as part of Death Valley back in 1952 in order to protect the rare pupfish which reside there. There's not much to see when you visit Devil's Hole. In fact, about the most interesting thing to look at is the interpretive sign. The entire area is fenced off, so at best, you can look through the fence down into the small pool area.  I'm including scans of both a map and an informational page from the U.S. Fish & Wildlife Service, to provide some extra information about the area.  You can pick up one of these small guides yourself, if you stop near the Ash Meadows National Wildlife Refuge sign when you first enter the area.  Something interesting about Devil's Hole is that earthquakes from the other side of the planet sometimes create waves and water surges in the watery cavern.  On March 20, 2012 a 7.3 magnitude earthquake in Oaxaca, Mexico some 1,700 miles away hit Devil's Hole about 10 minutes later.  What started out as inch-high waves ended up surging to more than 2 feet.  Researchers on location filmed video of this and you can see that if you search the internet for it.  Water ripples were also observed at Devil's Hole after the 9.0 March 2011 Japan earthquake and the 6.9 April 2010 earthquake in western China.
This map of Devil's Hole shows that it is located in the middle of the Ash Meadows Wildlife Refuge, although it is a part of Death Valley National Park:
This page from the free booklet informs visitors about Devil's Hole:
A gravel road leads into Ash Meadows National Wildlife Refuge.  Near this sign, pick up one of the free booklets about the area:
It's just a short walk down this path from where you park to the fenced off Devil's Hole:
As you can see in this photo, the entire area is fenced off with barbed wire to protect the pupfish:
This sign reminds visitors to stay out of the protected area, and it gives directions to reach the overlook area:
This is the observation platform for viewing Devil's Hole:
This interpretive sign is the highlight of a visit here.  It has a nice picture of the pupfish and tells about the importance of protecting it:
The view through the fence opening down into Devil's Hole:
The next two photographs show what Devil's Hole looks like as you're viewing it:
The next two photos show Steve looking into Devil's Hole.  Eeyore already had his turn:
After we finished looking in Devil's Hole, we walked around the perimeter of the fence to get some different views.  This is another view of the observation platform:
From the very top part of the fenced area (up the hill), we looked down at the surrounding refuge area and entrance path:
Now we are on the opposite side as the viewing platform, where somebody else was now looking down into Devil's Hole:
This last photo is of the weather station which monitors conditions in the area:
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