The Armath system existed within the Mikaster sector, which itself was a part of the Trailing Sectors area of the Expansion Region. This system included the planet called Armath. It was to this planet that Ambassador Zell from Majoor journeyed in 15 BBY for a peace mission.
The system of Armath initially appeared in The Essential Atlas, a 2009 reference book authored by Daniel Wallace and Jason Fry. The book specified its location as grid square N-15.