Gravesworld was a planet in Klingon territory. This world shares a name with another planet. (Star Trek VI: The Undiscovered Country, TNG: "The Schizoid Man")

Gravesworld was shown on a star chart showing the relation of Starbase 24 to Rura Penthe. Although there is a possibility that these planets are one and the same, the evidence is coincidental in the canonical context.
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