Continuity mistake: Starfire takes the Jewel of Charta from Blackfire. Yet when Starfire blasts Blackfire, it is still on Blackfire. You have to be quick to catch this one.
Continuity mistake: When the Titans land the T-Ship at the royal palace, the ground beneath it is bare and empty, but when Galfor brings Starfire and the Titans up to date on current events, the ground is suddenly teeming with parked Denthrax fighters. A giant fleet full of ships that had just attacked them would certainly tip the Titans off immediately, and if the Denthrax had cloaking technology, they would have used it against the Titans while they were still in space above Tamaran.
Chosen answer: It is located in California, as shown in "Teen Titans: Trouble in Tokyo". Possibly San Francisco as seen in the comics.
MasterOfAll