Queen's Harbor is a stage in Tekken 6's Scenario Campaign mode. Lili is fought here, and she reveals that the ship belongs to her family. Clearing this stage will unlock Lili in Scenario Campaign and Arena mode. This stage is located near a harbor, hence the stage's name.
"Anchored in the harbor was a cruiser with the exterior of a tanker. It was piloted by an aesthetically pleasing young female who supplied the keyword "Mishima Zaibatsu." She described them as an exceedingly vile organization. Perhaps Lars is also the enemy. I prefer not to consider that option".