Why is the Atacama Desert called the “Driest Desert in the World”?

Why is the Atacama Desert so dry?

The Atacama Desert is located in a zone called the “shadow of rain”. This is determined by its geographical location: between the Andes mountain range, which blocks the humid air of the Amazons, and the Coastal mountain range, which interjects between the air currents that come from the Pacific Ocean.

The wind and ocean flows fulfill a key role in the formation of this especially dry part of the planet. The Pacific anticyclone, for example, blows up from the South Pole towards the north, bringing with it cold and dry air, while Walker circulation works to move the clouds. Meanwhile, the famous Humbolt oceanic current produces a thermal inversion that impedes the formation of humidity in the zone. Basically, there is an absence of rains and high evaporation.

These natural, complex, and dynamic factors make the Atacama Desert an incredibly dry place. Nevertheless, this does not mean that there is no water. There are numerous underground reserves which have accumulated over thousands of years and are still being investigated. In fact, the hotel Tierra Atacama gets its water supply this way, so as not to affect the water consumption of the locals of San Pedro. This is just one of their sustainable initiatives to protect the native environment.

It is important to note that there does exist an even more arid desert on the planet: the dry valleys of Antarctica. Which is why it’s more precise to say that the Atacama Desert is the driest non-polar place in the world.

The impressive landscapes formed in the Atacama Desert not only amaze during the day with its beautiful sunrises and sunsets. At night, these special geographic conditions allow for an absolutely clear sky. For this reason, astronomers from around the world have come here to study the universe, developing the most important network of observatories.

We invite you to discover the marvelous scenery that the Atacama Desert has for you and your family. Book now or contact our reservations team for more information.