Erg (landform) and western Asia, and Central Australia. In South America, ergs are limited by the Andes Mountains, but they do contain extremely large dunes in coastal Peru and northwestern Argentina. They are also found in several parts of the northeast coast of Brazil. The only active erg in North America is in the Gran Desierto de Altar () that extends from the Sonoran Desert in the northwestern Mexican state of Sonora to the Yuma Desert of Arizona and the Algodones Dunes of southeastern California. An erg that has been fixed by vegetation forms the Nebraska Sandhills (). Sand seas and dune
Varieties of Arabic French in Lebanon, and English and Hebrew in Israel. However, a much more significant factor for all five dialect groups is, as Latin among Romance languages, retention (or change of meaning) of the form of Classical Arabic used in the Quran. The following example illustrates similarities and differences between the literary, standardized varieties, and major urban dialects of Arabic. Maltese, a distantly related Siculo-Arabic language descended from Maghrebi Arabic is also provided. "True pronunciations differ; transliterations used approach an approximate demonstration. Also, the pronunciation of Modern Standard Arabic differs significantly from region to region." For the sake of comparison, consider