Alpha/Beta Quadrant Overview
Son'a was a location in the Alpha Quadrant.
In 2256, its location was labeled on the star chart "Alpha/Beta Quadrant Overview" in the ready room aboard the USS Discovery. (DIS: "Magic to Make the Sanest Man Go Mad")
In 2257, during the first Federation-Klingon War, this location was occupied by the Klingons. (DIS: "The War Without, The War Within")
In 2259, Son'a's location was labeled on a stellar cartography chart that was seen on the USS Enterprise's ready room viewscreen. Son'a's symbol had a blue color, indicating that it was affiliated with the United Federation of Planets. (SNW: "Strange New Worlds", "Spock Amok")
Son'a's location was labeled in a Federation star chart that was in Fleet Admiral Kirsten Clancy's office at Starfleet Headquarters in 2399 and on the bridge of the USS Titan-A in 2401. This location was in or near to neutral space. (PIC: "Maps and Legends", "The Next Generation", "Disengage")
This location was only mentioned in writing.
The Son'a may be associated with this location.
According to Star Trek: Star Charts (p. 62) and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), Son'a was an M-class star.