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Erg Chebbi (Arabic: عرج شبّي) is the sole Saharan erg in Morocco. In places, the dunes rise up to 150 metres (490 ft) from the surrounding hamada (rocky desert) and altogether, it spans an area of 28 kilometres (17 mi) from north to south and up to 7 kilometres (4.3 mi) from east to west, lining the Algerian border.