The Ywllandr system, a star system, existed in the Prefsbelt sector of the Outer Rim Territories.
In the later period of the Clone Wars, the Confederacy of Independent Systems utilized it as a strategic bottleneck.
During the Outer Rim Sieges, a battle transpired at this location, where Plo Koon commanded a Republic Navy task force from the Courageous against the Separatist forces.