GH-531 was a planet situated within the Unknown Regions. It served as the location of a communications station established by the Galactic Empire, which the First Order subsequently seized control of before the war erupted between the First Order and the Resistance.
This world, GH-531, found in the Unknown Regions, was a desolate, rocky, and windswept place. Unique atmospheric conditions existed there, disrupting all communications signals transmitted nearby and hindering scanning operations. Frequent powerful winds and ion storms ravaged the planet's surface, and the atmosphere was scarcely breathable for the majority of sentient species.
The Galactic Empire selected GH-531 as the site for a communications station because of its unusual atmospheric conditions. The planet's whereabouts were not widely known, and the Empire kept it a secret. During the Battle of Jakku in 5 ABY, Captain [Telanasi] of the New Republic stole the coordinates of the base on GH-531, along with those of hundreds of other Imperial bases in the Unknown Regions, from the Star Destroyer Eradicator. However, Telanasi's starship, the CR90 corvette Starlight Wanderer, was soon after shot down and crashed on the planet Jakku, preventing the Republic from receiving the locations of GH-531 and the other Imperial facilities.
Later, before the war started between the First Order and the Resistance, the First Order took over the base on GH-531. A small military garrison was kept on the planet under the command of Captain [Talkar]. Shortly after the Hosnian Cataclysm, the Resistance sent a team of agents to GH-531 on a mission to obtain communications data from the First Order base that could aid their war effort, having discovered GH-531's location from the Starlight Wanderer crash site.