Badwater Salt Flats - Death Valley National Park EarthCache

Welcome to Death Valley

Located in the heart of Death Valley National Park, the Badwater Salt Flats present an extraordinary example of a desert landscape shaped by evaporation, groundwater, and extreme climate. What looks like a flat, endless white plain is actually a dynamic environment where mineral deposition, water movement, and seasonal changes interact to create intricate patterns on the surface. This EarthCache invites you to explore the processes behind salt flat formation, polygon cracking, and the influence of extreme heat and dryness on this unique ecosystem.

This EarthCache was created in correspondence with and with permission from the Death Valley National Park Service. Respect and follow all park regulations during your visit. Please help protect Death Valley by picking up your trash, staying on designated roads, and never feeding wildlife.

The Story of the Badwater Salt Flats

The story of the Badwater Salt Flats begins with water trapped in a low basin where it has no natural outlet. Rain or occasional runoff from nearby mountains collects here and slowly evaporates under the intense desert sun. As water evaporates, it leaves behind salts and other minerals, gradually building a thick crust that covers the flats. Groundwater can also carry dissolved salts to the surface, contributing to ongoing mineral deposition. Over thousands of years, repeated cycles of flooding and evaporation have created the vast, reflective expanse you see today, where the flat surface is interrupted only by polygon-shaped cracks that record the stress and movement of the salt crust.

Polygon patterns form because of contraction and expansion in the salt crust. During the day, heat causes the crust to expand, while cooling at night causes it to contract. When the crust can no longer adjust smoothly, it cracks along edges that intersect to form mostly hexagonal or polygon shapes. Occasional rain can fill these cracks with thin layers of water, softening the crust and adding new mineral layers as the water evaporates again. Over time, repeated cycles of this process make the polygons more pronounced, giving the flats a distinct puzzle-like appearance. These formations provide insight into the interaction of climate, mineral deposition, and physical stress in a desert environment.

Although the surface seems barren, life persists in the flats. Microbial mats live in shallow pools when water is present, and migratory birds occasionally visit to feed. The flats also demonstrate principles of physics and geology: the flatness comes from both repeated sediment deposition and the natural leveling effect of standing water, while the polygon cracks illustrate stress distribution in expanding and contracting materials. Observing the Badwater Salt Flats allows you to connect geological processes with ecological adaptation and physical principles, showing how even a harsh desert environment is shaped by interconnected natural forces.

Tasks for This EarthCache

To log this EarthCache, visit the site and complete the following tasks. Send your answers via Geocaching or email.

1. Include "Badwater Salt Flats - Death Valley National Park - GCBCQ6Z" on the first line of your message.

2. Observe a section of the salt crust. Do you see polygonal shapes in the salt? If so, describe their shape and estimate their size. If not, describe the surface texture instead and explain why polygon patterns may not be present.

3. Look for variations in the crust’s surface. Are there areas that appear smoother or rougher, wetter or drier? What processes might be responsible for these differences?

4. Consider the surrounding landscape. How do nearby mountains, slopes, or alluvial fans contribute to water or sediment reaching the flats?

5. Note any signs of life or water presence in the flats. How does the presence of water or microbial mats influence the appearance or structure of the flats?

6. In your log, attach a photo of yourself or a personal item at the posted coordinates with the Badwater Salt Flats in the background. (Note: photos predating the publication of this EarthCache are not accepted.)