From WoWWiki

The Scarab Wall lies at the southern edge of Silithus, marking the boundary between the silithid-controlled desert and the ancient kingdom of Ahn'Qiraj. It is an impressive structure, including some sort of magical shield that also prevents creatures capable of flight to simply fly over it.

There is a World Event to open the Gates of Ahn'Qiraj.

See:

• Ahn'Qiraj for information on the area and lore
• Gates of Ahn'Qiraj and The Scepter of the Shifting Sands quest chain for details on the massive quest to open those gates.

Subzones of Silithus
Bones of Grakkarond • Bronzebeard Encampment • Cenarion Hold • The Crystal Vale • Hive'Ashi • Hive'Regal • Hive'Zora • Ortell's Hideout • Ravaged Twilight Camp • The Scarab Dais • The Scarab Wall • Southwind Village • Staghelm Point • The Swarming Pillar • Twilight Base Camp • Twilight Outpost • Twilight Post • Twilight's Run • Valor's Rest

Bronze Dragonflight
Aspect	Nozdormu the Timeless One - Aspect of Time
Notable Members	Alurmi • Anachronos • Andormu • Arazmodu • Chronormu • Erozion • Grakkarond • Indormi • Nozari • Sa'at • Soridormi • Tydormu • Zaladormu • Zephyr
Factions	Brood of Nozdormu • Keepers of Time • Scale of the Sands
Important Locations	Caverns of Time (Home) • Andorhal • Scarab Wall • Silithus • Staghelm Point • Tanaris