Inconspicuous Landmark
From WoWWiki
The Inconspicuous Landmark can be found on Land's End Beach in Tanaris. [55.6, 92.2]
Objective of
Using this landmark for the quest 
[45] Cuergo's Gold will summon 5 pirates (Treasure Hunting Buccaneer, Treasure Hunting Pirate, and Treasure Hunting Swashbuckler) as well as the chest labeled Pirate's Treasure!.
