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 a Diff'rence a Day Made the US soul and Top 40 charts. Phillips performed the song on "Saturday Night Live", during its first season. The song, as performed by Dinah Washington, is used in the soundtrack of the following films: What a Diff'rence a Day Made "What a Diff'rence a Day Made", also recorded as "What a Diff'rence a Day Makes", is a popular song originally written in Spanish by María Grever, a Mexican songwriter, in 1934 with the title "Cuando vuelva a tu lado" ("When I Return to Your Side"). The song is also known in English as “What a Diff'rence a Day Makes”,