The Ravaner system is a solar system.

In 2379, a contingent of Starfleet Special Operations personnel was able to capture a Breen vessel in the Ravaner 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)

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