Alternate timeline
(covers information from an alternate timeline)
the Cambra system was a star system.

In the original future, Alexander Rozhenko met a man in the Cambra system during 2410 who offered him a chance to travel back in time. Alexander traveled forty years into the past to the year 2370, where he changed history by encouraging his younger counterpart to follow the ways of a Klingon warrior and thereby preventing the death of his father. (TNG: "Firstborn")

This system was only mentioned in dialogue.
In the novel Watching the Clock, it was implied that the man whom Alexander met in the Cambra system was the Klingon scientist Korath, who appeared in VOY: "Endgame" and Star Trek: The Experience.
According to Star Trek: Star Charts (p. 65) and the Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the Cambra system was located in the Beta Quadrant. The primary was a K-class star.

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