An'daroth.
An'daroth is a ley-line nexus once used by the Quel'dorei of Quel'Thalas prior to the Scourge invasion located in the northwestern Ghostlands. It's found east of Goldenmist Village and west of Elrendar Crossing. Around the time the Sin'dorei first joined the Horde, a night elven camp of Sentinel spies and their leader made this area their base of operations.
An'daroth, along with An'telas and An'owyn, was a heavily-guarded, hidden location in Quel'Thalas which held a piece of mooncrystal for the Key of the Three Moons, that, when combined, produced a powerful key to bring down the second Moongate. During Arthas's mission to the Sunwell, to resurrect the rotting remains of Kel'Thuzad, a traitorous Quel'dorei wizard named Dar'Khan Drathir provided Arthas with information about the Key of the Three Moons and their whereabouts.
Soon after, Lor'themar Theron and his elven rangers arrived at the camp, only to be attacked by reanimated elves. Here, Theron lost his left eye and only the timely arrival of Halduron Brightwing and his group saved the future Regent Lord.
When Alleria Windrunner came to the Ghostlands in search of Magister Umbric, she and the Alliance champion teleported into the camp.
Adapted from WoWPedia
