Geology and Minerals
The Grand Erg Occidental, (also known as the Western Sand Sea), Arabic العرق الغربي الكبير (al-ʿIrq al-Ḡarbī al-Kabīr), is an erg in the northern center of the Algerian Sahara. It is the third largest erg in Algeria after the Erg Chech and the Grand Erg Oriental.
Askja.
Cascade-Sierra province.
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