The Atacama Desert is on the Pacific coast of South America.
Along the Pacific Ocean. (West)
The Atacama Desert which is located along the Pacific Coast of northern Chile.
Some say that the Atacama Desert on the Pacific Coast of South America is the driest desert on earth. Others say that Antarctica is even drier.
Penguins DO live in the desert. There is a species that occupies hillsides along the Pacific Ocean in the Atacama Desert in South America.
The Atacama is on the northwestern coast of Chile.
Only the Pacific coast along South America is desert. Most of the Pacific coast line in the rest of the Americas is not desert. In South America the prevalent wind direction is from the east. The Andes Mountains prevent moisture from the east from crossing, creating a rain shadow desert along the Pacific Coast. In North America the prevalent wind direction is from the west so the coast receives rain. However, the mountains prevent the rain from moving inland so rain shadow deserts form in these areas.
The Atacama Desert of Chile, Peru, Argentina and Bolivia is along the Pacific Ocean as well as the Sechura Desert of Peru.
You did not provide the name of a continent in your question. However, in North America the Sonoran Desert reaches the west coast of Mexico. In South America there is found the Atacama Desert along the coast and in Africa the Namib Desert borders the Pacific. There are others.
By 'these mountains' I assume you are referring to the Andes Mountains of South America. The desert formed in the rain shadow of the Andes is the Atacama Desert.
The Atacama Desert is located in northern Chile, southern Peru and small parts of Bolivia and Argentina.
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Both the Atacama and the Sechura Deserts are on the west coast of South America,