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
What Is a Nation? Anderson also points out that the reason many French citizens of Renan's time knew anything of these massacres was because they learned of them in state-run schools. Thus, the state itself preserved the knowledge which needed to be forgotten for national identity. In a 1995 book, "For Love of Country: an essay on patriotism and nationalism", Maurizio Viroli called Renan's essay "the most influential late nineteenth-century interpretation of the meaning of nation", because of its focus on the "spiritual principle" as opposed to race, religion or geography. Other authors, like Joxe Azurmendi, consider that really there is no such opposition