Morska was an inhabited Klingon planet on which a grounded subspace monitoring outpost was located.
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 in 2376. (VOY: "Child's Play", display graphics)
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.
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