The zone is accessed via expedition. You'll need to speak with Eldros Danmor to activate it. He's in Nedaria's Landing on the southern pier. Say to him "Interested in visiting" to activate.
Along the northern edge of the zone is a cave. In the first room in the cave is a stone by itself on the southern wall is the stone you click on to zone in. The expeditions last for up to six hours and have no lockout timer.