Morska was an inhabited Klingon planet in the Morska system, in the Beta Quadrant, on which a grounded subspace monitoring outpost was located.
In 2256, Morska's location was labeled on the star chart "Alpha/Beta Quadrant Overview" in the ready room aboard the USS Discovery. This star was located in the territory of the Klingon Empire. (Star Trek VI: The Undiscovered Country; DIS: "Choose Your Pain", "Magic to Make the Sanest Man Go Mad", "The War Without, The War Within")
A year later, its location was labeled on the star chart showing the trajectory of Lieutenant Spock's shuttle. (DIS: "An Obol for Charon")
The USS Enterprise-A passed near Morska, when on course to Rura Penthe to rescue Kirk and McCoy, in 2293. Fortunately, Communications Officer Uhura was able to convince two Klingon officers stationed on Morska that the Enterprise was a legitimate Klingon ship, sent to ship food and supplies down to the prison. Star Trek VI: The Undiscovered Country)
In 2376, the location of Morska was labeled on a star chart in astrometrics on USS Voyager. (VOY: "Child's Play", display graphics)
In 2399, the location of Morska was labeled on a star chart that was in Fleet Admiral Kirsten Clancy's office at Starfleet Headquarters. (PIC: "Maps and Legends")
In 3189, the location of Morska was denoted on a holographic star chart of the galaxy at Federation Headquarters. (DIS: "Die Trying")
Through the windows in the background of the scenes, the matte paintings are visible. They make the section the outpost was located in look like a desert with mountains.