The Epsilon Mynos system was an inhabited planetary system located somewhere in the Alpha or Beta Quadrant, It was a single star system consisting of a primary and the planet Aldea, which was the homeworld of the Aldeans.
For centuries, legends identified this system as the location of the fabled civilization on Aldea. In 2364, Aldea made first contact with the Federation starship USS Enterprise-D. (TNG: "When The Bough Breaks")