Qualla: Erg Iguidi

Erg Iguidi: Introduction

Sun, 14 Jun 2026 00:00:00 GMT

Photo credit NASA, Public domain. From above, the Erg Iguidi looks combed. For 400 kilometers the dunes run in long parallel ridges, narrow and linear, as if a vast hand had dragged its fingers across the desert and left the grooves behind. This is one of the great sand seas of the northwestern Sahara, spilling across the borders of southwestern Algeria, northern Mali, and Mauritania. An erg is not just desert but a particular kind of desert — an ocean of wind-built sand — and the Iguidi is among the most striking, its dunes climbing to a high point of 540 meters above the surrounding land.

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Image: NASA | Public domain

Erg Iguidi: An Ocean Made of Sand

Sun, 14 Jun 2026 00:00:00 GMT

Photo credit NASA, Public domain. The word erg comes from Arabic and means a sea of dunes, and the comparison is exact. Like an ocean, an erg is shaped entirely by movement — here, by the wind. The Erg Iguidi's signature is its linear dunes, long straight ridges aligned by the prevailing winds rather than the cre...

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Image: NASA | Public domain

Erg Iguidi: The Greener Desert

Sun, 14 Jun 2026 00:00:00 GMT

Photo credit NASA, Public domain. For all its severity, the Erg Iguidi is not entirely lifeless, and compared to its neighbor it is almost lush. To the south lies the Erg Chech, drier and harsher; the Iguidi, by contrast, is relatively humid. Groundwater gathers especially toward its north-eastern edge, close eno...

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Image: NASA | Public domain

Erg Iguidi: Reading the Dunes

Sun, 14 Jun 2026 00:00:00 GMT

Photo credit NASA, Public domain. To stand in the Erg Iguidi is to lose every familiar reference point. The horizon is sand meeting sky, the ridges marching away in every direction, the wind erasing footprints almost as fast as they are made. Yet the dunes are not random. Their alignment records the wind, their h...

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Image: NASA | Public domain