Delta Outpost 4

Delta Outpost 4 was a Federation Delta Outpost. This outpost was located in the Alpha Quadrant, on the Federation-Klingon border.
In 2257, during the first , this outpost was occupied by the Klingons. () 
In 2259, the location of this outpost was labeled on a stellar cartography chart that was seen on the 's ready room viewscreen. The outpost had been returned to the Federation. () 
Delta Outpost 04