Sahara, the Great Desert

Africa Ahaggar Algerian alluvial already ancient appearance Arabic Atlas basin become beds Berber called camel century certainly Chad climate closed coast communication consider course direction dunes eastern Egypt Egyptian entirely erosion established evidence existence extends extreme fact feet Fezzan fluvial followed force formation French geological give human Igharghar immense importance influence interesting Italy known lake least less Libyan Desert Lower Mediterranean miles mountains native natural never Niger Nile nomads oases oasis Occidental oriental origin particularly perhaps period places plateaus population portion powerful practically present Quaternary rains range reach reason recent region relief remains river rock Roman route Sahara salt sand sandstone Saura seems side Sudan surface terminal throughout Tibesti tion tribes true Tuaregs valley wadi western whole wind