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Rio Loa is the longest river of the Atacama desert in Chile, forming a green oasis in the desert canyon.

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Title: Rio Loa is the longest river of the Atacama desert in Chile, forming a green oasis in the desert canyon.

Rio Loa is the longest river of the Atacama desert in Chile, forming a green oasis in the desert canyon.

Credit: Gerhard Hüdepohl / atacamaphoto