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
Erg (comics) mutants that the tags were "...a harmless tracking device, inserted under the skin with a simple and painless surgical process." That was not true, as Erg later discovered, as the tags had the ability to generate disabling electronic pulses. Later, Mister M freed the chipped mutants of their devices. During "The Extremists" arc, Erg reappeared alongside some of his fellow Morlocks under the leadership of Masque. Besides Erg, this group consisted of Bliss, Litterbug, the undercover Skids, and the captured Leech. Erg is shown as one of Norman Osborn's mutant prisoners after the riots in San Francisco. He later took