A planet near the Demilitarized Zone where Sisko goes to meet an informant, and instead comes face to face with Michael Eddington, at the start of For the Uniform.
Marva IV appears in the opening scenes of For the Uniform. Eight months after Michael Eddington, his security chief, deserted to the Maquis, Sisko travels to the planet to meet an informant named Cing'ta who has promised to reveal where Eddington can be found.
The settlement there is a bleak refugee camp for people displaced from the Demilitarized Zone. Sisko finds that Cing'ta has been discovered, and Eddington himself is waiting, eager to justify the cause and to show Sisko the misery the treaty with Cardassia has produced.
Eddington beams away to a Maquis raider and Sisko pursues in the Defiant, only for the ship's systems to collapse under a virus Eddington planted before he defected. The encounter sets up the personal contest that drives the rest of the episode.