There is a place on Earth where rain is so rare that a storm can become a historic event.
The Atacama Desert stretches along the northern coast of Chile, a vast landscape of salt flats, volcanic mountains, barren valleys, and rock that appears almost untouched by weather. It is widely considered the driest non-polar place on Earth. In some of its most arid regions, scientists have recorded no measurable rainfall for decades. Some areas have gone even longer without recorded rain.
At first glance, the Atacama looks like what most people imagine when they hear the word desert. But even the world’s most famous deserts receive considerably more water. The Atacama is operating on an entirely different scale. In some areas, annual precipitation can be measured in mere millimeters, while certain hyper-arid regions may go years or even decades without significant rainfall.
The remarkable thing is that the Atacama is not simply dry because it happens to be located in a hot place. Its extreme aridity is the result of several geographical forces working together. The cold Humboldt Current flows along the coast, cooling the air and limiting evaporation. A persistent high-pressure system suppresses the formation of rain-producing weather. And to the east, the Andes create a massive rain shadow, blocking much of the moisture that moves across South America from the Amazon Basin.
The result is a landscape that can look almost extraterrestrial. NASA has used the Atacama as a testing ground for instruments and techniques designed to search for life on Mars because the desert’s soil and extreme dryness provide one of the closest environments on Earth to the Martian surface. In some of the most arid areas, even microorganisms struggle to survive.
Yet the Atacama is not entirely without water. Along parts of the coast, moisture arrives not as rain but as fog. Known locally as camanchaca, this dense coastal fog can provide enough moisture for specialized plants and organisms to survive in an environment where rainfall is almost nonexistent. Elsewhere, underground water and distant mountain runoff support isolated pockets of life. Even in one of the driest places on the planet, water has found ways to remain.
That is part of what makes the Atacama so fascinating. It is not a dead landscape. It is a landscape where life has been forced to become exceptionally selective.
When rain does arrive, the transformation can be extraordinary. Seeds that have remained dormant in the soil can suddenly germinate, and parts of the desert can erupt into fields of wildflowers. The phenomenon is so rare that it is known as the desert’s “flowering,” turning an apparently lifeless landscape into a temporary burst of colour. In 2025, unusually heavy precipitation produced a particularly spectacular bloom in parts of northern Chile.
The Atacama also offers a reminder that the idea of a place where it “never rains” needs a little precision. Earth is full of exceptions. Even the driest landscapes can experience unusual weather. In fact, recent heavy storms in northern Chile have caused flooding in areas that are normally defined by their extraordinary lack of rain.
But the larger truth remains astonishing. There are places on this planet where rain is so rare that generations can pass without seeing a meaningful storm. Where a few millimetres of precipitation can transform the landscape. Where scientists search for the faintest signs of life because the conditions are so extreme that they resemble another world.
The Atacama does not look like a place waiting for rain, rather, It looks like a place that has learned how to live without it.
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