The Japreal system is home to the planet Onderon along with two others (Japreal & Iznica) which was once the home of a primitive race of humanoids. These three planets orbit around a K-IV type star named Prael . Onderon is the only planet with moons (four). Onderon is the most earth-like planet while Iznica is hot and dry but the atmosphere is breathable to humans, and Japreal is similar to Onderon but colder since it is farther from Prael.

During the ancient times, when the Mandalorian waged war on their own, Dxun and Onderon were among the first worlds to be conquered by the brave Mandalorians. However, there were some people from the Old Republic that intervene, and the brave Mandalorians were pushed outside the system and its worlds. Then the system came under the supervision of the Republic until a new government could be installed.

Many centuries later, when the Republic fell, no one really cared about this system, so it remained unclaimed and neutral through most of the conflicts thereafter.