Sahara Skyline, Chad, 1998

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英文注释：

Rocky skylines and dunes red with iron oxide make for a Martian landscape in northern Chad. Evidence of the Sahara's ancient seas and rivers, sandstone pinnacles were eroded by rainfall. The Sahara—the largest desert in the world—gets its name from the Arabic word sahra, or desert.

— Text and photograph from "Journey to the Heart of the Sahara," March 1999, National Geographic magazine

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