2279 PL
From Memory Alpha, the free Star Trek reference.
2279 PL is a position or region of space located near 2466 PM. It is approximately 22.3 parsecs beyond Cestus III and the Federation's chart limits during the late 23rd century.
In 2267, a Gorn starship passed through this region as it was pursued by the USS Enterprise. (TOS: "Arena")
