United Federation of Planets
Archanis IV was the inhabited fourth planet of the Archanis system. This system, located close to the Federation-Klingon border, was in the Archanis sector. (TOS: "Day of the Dove"; DS9: "Broken Link")
Prior to the beginning of the Federation-Klingon War, Gowron sent a message to the Federation Council, telling them to remove all Starfleet forces from the planet and the system. The planet was soon taken over by the Klingons, although Starfleet would be regrouping for a counter-attack on the Archanis sector some months later. (DS9: "Broken Link", "Apocalypse Rising", "Nor the Battle to the Strong")
According to the episodes "Apocalypse Rising" and "Broken Link", the pronunciation for Archanis was "are-KANE-is". 
The fate of Archanis IV after the brief Federation-Klingon war ended in mid-2373 had not been mentioned on screen.