Romulan Neutral Zone map

A partial map of Earth Outpost Stations along the Romulan Neutral Zone

The Earth Outpost Stations were a series of outposts constructed on asteroids located in Sector Z-6 and in neighboring sectors, along the Federation side of the Romulan Neutral Zone. They were established by a Treaty after the Earth-Romulan War of the 2160s, which allowed United Earth, and subsequently the Federation, to monitor its side of the Neutral Zone.

In 2266, four of the eight outposts came under attack from a powerful plasma weapon used by a Romulan Bird-of-Prey; this sneak attack completely destroyed outposts 2, 3, 4, and 8. (TOS: "Balance of Terror")

Nearly a century later, a border outpost reported seven Romulan battle cruisers had come within its sensor range – a violation of the Treaty and even a potential prelude to an attack. The outpost sent out a distress call, to which the nearby USS Berlin responded. Starfleet also requested that the USS Enterprise-D join the Berlin to project a deterring show of force against the Romulans – which was also a necessary tactical move to ensure that, should a conflict erupt, the Romulans would not have the advantage. Nothing came of this, and the Romulans chose not to engage or even communicate with Starfleet until later that year. (TNG: "Angel One", "The Neutral Zone")

By 2367, the Neutral Zone outposts had expanded in number, possibly to as many as twenty-three (see Outpost 23). Additional outposts in the region included Outpost Sierra VI. (TNG: "The Defector", "Future Imperfect")

The revised final draft script of "Balance of Terror" requested that Earth Outposts 1 to 11 be shown in a star chart which appears in that installment, though only Outposts 1 to 7 are shown in the final version of that display.
While Earth Outpost 23 does not appear in the star chart, there may have been up to twenty-three Earth Outposts established along the Romulan Neutral Zone by 2160. (Star Trek: Star Charts, p. 66)
An okudagram map seen in Starlog Press publication The Official Star Trek: The Next Generation Magazine depicted a portion of the Romulan Neutral Zone. On the map, the locations of Outposts 1-7 were depicted in Federation space. Outposts 41 and 42 were depicted in space claimed by the Klingon Empire. [1]
Community content is available under CC-BY-NC unless otherwise noted.