Diana's Punchbowl, Geothermal spring in Monitor Valley, Nevada.
Diana's Punchbowl is a geothermal spring in Monitor Valley, Nevada, set inside a travertine dome that rises gently from the desert floor. The spring opens at the top of the dome as a roughly circular pool, with hot water visible at the surface and mineral deposits building up along the edges.
The spring formed along a fault line in Nye County, where heat and pressure from deep underground push hot water toward the surface. Over thousands of years, the minerals carried by that water slowly built up into the travertine dome that visitors see today.
The spring goes by two names locally: Diana's Punchbowl and Devil's Cauldron, each reflecting a different way of reading the same deep, steaming hollow. Visitors standing at the edge can see why both names stuck, depending on the light and the mood of the water.
Reaching the site requires a high-clearance vehicle, as the road through Monitor Valley is unpaved and can be rough in places. The area is remote, so it is wise to bring extra water and supplies and to tell someone your plans before heading out.
The water in Diana's Punchbowl is hot enough that heat-resistant algae are among the very few living things that can survive in it, and these algae produce colors that tint the water and the surrounding rock. The shades can shift depending on the season and the angle of the light, so the pool rarely looks exactly the same twice.
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