Monac IV was the fourth planet of the Monac system in Cardassian space, where the Cardassian/Dominion Monac shipyards were located.

In 2375, the Monac shipyards were a crucial production facility for the Dominion effort to retake the Chin'toka system. A Klingon fleet launched an attack on the shipyards, but were repelled with casualties estimated at 30%. (DS9: "Image in the Sand")

Shortly after, the Klingon Bird-of-Prey IKS Rotarran, under the command of General Martok, destroyed the shipyards by triggering a solar flare that engulfed the installation. (DS9: "Shadows and Symbols")