The Salar de Uyuni in Bolivia is known for its stunning mirror-like surface when covered with a thin layer of water. Many people consider it to be the world’s largest natural mirror. However, this claim had not been scientifically verified until now.
In a new study published in the journal Communications Earth & Environment, researchers used data from Sentinel-3 satellites to investigate the salt flat’s surface. The satellites are equipped with radar altimeters that send out pulses and measure how much of the signal bounces back. A stronger return signal indicates a smoother surface.
The researchers analyzed over 390,000 samples from 2016 to 2024. They also conducted on-the-ground measurements during the peak wet season in February 2024. This included using an optical tool to measure the water’s surface and a drone to capture images of the sun’s reflection.
The findings showed that the Salar de Uyuni is not a uniform mirror as previously thought.
New findings about Salar de Uyuni
Instead, the surface changes from place to place and over time.
The most mirror-like conditions occur after significant rainfall and before the water evaporates. “The Salar de Uyuni is not a vast uniform mirror as previously thought,” the researchers wrote in their paper. “Therefore, it is also likely that it is not a large mirror for optical wavelengths, as suggested in the literature.”
The researchers found a strong link between periods of high rain and the mirror effect.
This confirms that it is a direct result of the region’s climate patterns. They concluded that the best time to see the mirror effect is from late January to early March. Surprisingly, the study also found that wind did not spoil the mirror effect.
The researchers suggest this is because the water is so shallow that it prevents waves from forming, even in a breeze. This groundbreaking study has provided a more detailed understanding of the Salar de Uyuni. While it is not a perfectly uniform natural mirror, it does exhibit mirror-like qualities under specific conditions.
The findings shed new light on this stunning natural wonder.
