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
International Association of Arabic Dialectology International Association of Arabic Dialectology The International Association of Arabic Dialectology (, AIDA) is an association of researchers in Arabic dialects, from all over the world. AIDA was founded in 1992, in Paris, at the initiative of a group of prestigious Arabists, with the aim to encourage and promote the study of Arabic dialects. AIDA is nowadays the leading international association in this field of research and it has become a center that joins scholars from all over the world who are interested in any aspect of Arabic dialectology, including dialects which have not been described yet, dialectal geography, specific