Grand Erg Oriental follow the wind's direction. There are other types of dunes, as well as "complex" dunes. Saharan winds are also known to clear an area of sand altogether, leaving bare rock (hamada) or gravel (reg). The "Grand Erg Oriental" is accessible overland by an Algerian road, which goes south from Constantine. It passes through the Aurès mountains, then salt lakes by the city of Biskra. Next the road skirts the western edge of the erg. After about 500 km. in all, it reaches the ancient oasis of Ourgla [Wargla]. Since late antiquity Wargla was a stop for the Saharan trade, being
Influence of Arabic on other languages non-maghrebi French speakers. Arabic-derived words have entered standard or metropolitan French from two main sources. As is the case for many other European languages, one principal source was Spanish. The other was directly from Maghrebi Arabic as a result of the occupation and colonisation of the Maghreb, particularly Algeria, in the 19th and 20th centuries. Examples of the latter include 'bled', a slang term for place of origin, following this word's usage in the Maghreb, as opposed to the Standard Arabic "balad", 'country', along with the Maghrebi term 'kif kif' and 'tabeeb', a slang term for 'doctor'. A small number