The Ravanar system is a solar system in the Taurus Reach with at least four planets.

In 2263, Ravanar IV was visited by the USS Constellation. By 2265 it hosted a Starfleet Intelligence Outpost. (VAN novel: Harbinger)

In 2379, a contingent of Starfleet Special Operations personnel was able to capture a Breen vessel in the Ravanar system, although their actions were officially denied by the Federation Security Council. Ambassador Worf was able to obtain these schematics to trade to Imperial Intelligence agent Lorgh in exchange for blackmail information against Klingon Councillor Kopek. (TNG novel: A Time to Kill)

The Breen vessel disabled in the Ravanar system was later determined by Starfleet to be called the Guernik and that it had used by Breen privateers. (ST - Typhon Pact novel: Zero Sum Game)

Although not specified, since the Breen are native to the Alpha Quadrant, this system is likely in the Alpha Quadrant as well.
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