The Tumani system existed within the Interior Region, which itself was a part of the Hapes Cluster in the Slice section of the Inner Rim. Hyperlanes provided connectivity between it and both the Ediorung and Tinta systems. The system of Tumani was the place where the gemstones called Tumanian pressure-rubies came from.
The reference book The Essential Atlas, written by Daniel Wallace and Jason Fry and released in 2009, first introduced the Tumani system, locating it in grid square O-9.