The Sooncanoo system existed in the Northern Dependencies region of the Inner Rim. This star system was the location of the Galactic Republic's hyperspace beacon identified as Sooncanoo Beacon during the Waymancy Storm event of 7811 BBY. Subsequently, from 12 ABY to 13 ABY, the New Republic claimed the system as part of its territory.
Jason Fry's and Paul R. Urquhart's 2012 reference work, The Essential Guide to Warfare, was the first to feature the Sooncanoo system. It was located in grid square K-8 according to the Online Companion on StarWars.com for the 2009 reference book The Essential Atlas.