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
Influence of Arabic on other languages used the Arabic cognates. In the newer translations this practice is discontinued. They now turn to Greek names or use the original Hebrew Word. For example, the name Jesus was initially translated as 'Isa (Arabic: عيسى), but is now spelt as Yesus. Several ecclesiastical terms derived from Arabic still exist in Indonesian language. The Indonesian word for bishop is "uskup" (from Arabic: اسقف usquf = bishop, ultimately from Ancient Greek "episkopos"). This in turn makes the Indonesian term for archbishop "uskup agung" (literally great bishop), which is combining the Arabic word with an Old Javanese word. The term imam (from