An ocean-covered Federation world noted for its beauty, the venue of a 2365 conference that Antedean assassins planned to bomb before Lwaxana Troi exposed them.
Pacifica is a largely water-covered planet known for warm seas and white beaches. It is mentioned in two Next Generation episodes, Conspiracy and Manhunt.
In Conspiracy, set in 2364, the Enterprise-D is on its way to Pacifica for a scientific assignment, with the crew looking forward to the planet's oceans, when a coded message from Captain Walker Keel diverts Picard to Dytallix B.
A year later, in Manhunt, Pacifica hosts a conference at which the admission of Antede III to the Federation is to be considered. The Enterprise carries two Antedean delegates there, along with Lwaxana Troi, who represents Betazed. As the delegates are about to beam down she casually reads their minds and reveals that they are assassins whose robes are lined with ultritium, intended to destroy the whole gathering.