Issaouane Erg confined to basins. Sand in the Issaouane Erg, below the level of the sand dunes, has accumulated to a depth of 20 to 30 meters. It has barchan dunes as well as star dunes of 300 to 430 meters high. The presence of both barchan dunes (which form due to unidirectional winds) and star dunes (which form when winds from various directions deposit sand) "suggests that wind regimes have changed over time". NASA's "Earth Observatory" notes all three types of erg dunes are present in the photos of the Issaouane Erg taken from the International Space Station: stationary mega dunes,
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