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The Cardassian-Romulan border was the division between the Romulan Star Empire and the Cardassian Union. The Unefra system was located on the Cardassian side of the border, while the Glintara sector was located between the border and Romulus. (DS9: "Improbable Cause", "In the Pale Moonlight")
In 2371, a Cardassian informant told Odo that a number of Romulan ships, believed to be warbirds, were detected near the border, along with troop movements and increased communications activity. The informant admitted the Cardassian authorities considered this a possible prelude to a Romulan invasion, but that this made little sense. Central Command was unaware that the buildup was actually part of a top secret, joint Obsidian Order-Tal Shiar operation to launch a preemptive first-strike against the Founders' homeworld. (DS9: "Improbable Cause")
In the forged holorecording created by Grathon Tolar in 2374, the border was relatively undefended since the bulk of the Romulan military was deployed along the Romulan Neutral Zone. The Founders therefore predicted, that in the planned Dominion invasion of Romulan space the Dominion could be on Romulus in less than three weeks. (DS9: "In the Pale Moonlight")
During the Dominion War, Jem'Hadar forces frequently violated Romulan space by crossing the border in order to attack Federation targets near the Romulan Neutral Zone. The Romulans ignored these transgressions due to their Nonaggression pact with the Dominion. However, when the Romulans finally entered the war on the side of the Federation Alliance in 2374, they began by striking 15 outposts along the Cardassian-Romulan border, opening up a second front. (DS9: "In the Pale Moonlight")