One of a series of listening posts and defense stations along the edge of the Romulan Neutral Zone. The outposts were designed as an early warning system in the case of a Romulan attack on the Federation. With the destruction of Romulus, many of these outposts have been expanded to include space for researchers or cargo space for relief supplies.
- This system name is an homage to the PC game "Outpost II", from Sierra Software, a popular space simulation game in the late 1990's.
- Until its removal from the game as part of the 5 Year Anniversary Event, the mission “Minefield” took place in this system. Since then, the Sierra Outpost II System is only accessible during user-generated missions.