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The Crystal Vale is a valley in the far northwestern corner of Silithus. It is populated by earth and air elementals, and is a popular location for farming too. It is also the location of the final battle in the Thunderfury quest chain, with Thunderaan. If you use Cartographer, check out these coordinates: 23,15. One quest in the area is "The Twilight Mystery."

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