The Federation-Klingon border was the shared border between the United Federation of Planets and the Klingon Empire.

In early 2373 when the Klingons broke the ceasefire of the Federation-Klingon War, the Klingon Fourth Battle Group crossed the border and attacked the Federation colony at Belis IV. At the same time the Klingon Third Battle Group attacked Federation border planets and outposts.[1]


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