http://www.wowwiki.com/Alcaz_Island
Alcaz Island
From WoWWiki
Alcaz Island is a large island off the northeast coast of Dustwallow Marsh. Unlike the rest of the zone, it features tropical vegetation similar to the nearby Echo Isles. It is inhabited mostly by nagas, and hydras can be found in the water around the island.
While it is only a short swim from the coast, it can be rather dangerous since the monsters on and around the island are level 57-62 elite.
Under the surface of the island is a heavily guarded prison, where the missing king of Stormwind, Varian Wrynn was kept after his abduction by the Defias.
During the events surrounding the opening of the Gates of Ahn'Qiraj (in Patch 1.9), several changes occured. A malicious gnome, Doctor Weavil arrived on the island with his flying machine, and now resides in the largest house of the island, guarded by several of his minions. At the same time, King Varian Wrynn disappeared from his prison cell. It is unknown whether he was moved to a different prison or used the tumult caused by Dr. Weavil to escape. His current location remains a mystery, leading to many speculations. His former cell is now home to a naga called Tidelord Rrurgaz.
Trivia
Alcaz island is probably named after Alcatraz Island in San Fransisco Bay, California. There is another prison in the game with a similar name related to Alcatraz Island, the Arcatraz in Tempest Keep.