Port

The term port is generally used to refer to intercontinental ports; towns or outposts which allow travel between campaigns. When characters travel between different campaigns, they will always arrive at the appropriate port. In other words, when your character travels to another continent (i.e. campaign), your character will arrive at the port of the target campaign. There is currently only one intercontinental port per campaign

Intercontinental ports

 * Core - Great Temple of Balthazar
 * Prophecies - Lion's Arch
 * Factions - Kaineng Center
 * Nightfall - Kamadan, Jewel of Istan

Unlocking intercontinental travel
Unlocking travel to a given campaign requires the completion of one of the appropriate intercontinental travel quests, obtained from NPCs in the appropriate port. Travel quests from Tyria and Cantha become available immediately upon reaching the appropriate port, while travel quests from Elona are not available until after completing The Time is Nigh, a primary quest. Once a port town is unlocked, all the other possible quests to gain access to it will become unavailable. For more information, see campaign travel.

Local ports
Additionally, there are several ports which allow travel between areas or regions on the same continent by talking to the appropriate NPC.