The American city where Dahj Asha is living in 2399 when Zhat Vash assassins storm her apartment, killing her boyfriend and awakening abilities she did not know she had.
Boston is a city on the east coast of North America on Earth. In the Picard premiere, Remembrance, a caption identifies Greater Boston as the home of Dahj Asha, a young researcher celebrating her acceptance as a fellow of the Daystrom Institute.
Masked intruders beam into her apartment, murder her boyfriend and try to take her prisoner. Something in her activates: she kills all of them with startling speed and skill, then sees a vision of Jean-Luc Picard's face and flees to France to find him.
In the following episode, Maps and Legends, Picard and Laris visit the apartment. It has been scrubbed of evidence, but Laris's forensic techniques recover traces of the attack and of Dahj's calls to her twin, which show that the sister, Soji, is not on Earth at all.