Galador II was the inhabited second planet in its star system. This was the homeworld of the Galadorans. By 2370, Galador freighters regularly operated between Galador II and Farius Prime. (DS9: "The Maquis, Part I")
This planet was only mentioned in dialogue.
"GAL-uh-door" was the pronunciation for this planet's name from the script pronunciation guide. 
According to Star Trek: Star Charts (p. 47) and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the Galador system was located in the Alpha Quadrant. This was a quaternary system with four F-class stars. In the late 24th century, it was an independent system.