The Great Canyon existed as a naturally formed canyon located on the world of Teyr.
In the time of the Clone Wars, the Confederacy of Independent Systems established a forward operating base close to the Great Canyon, within a crashed Lucrehulk-class battleship.
General K'Kruhk commanded his clone troopers as they engaged the Separatists in combat through the Great Canyon. Anticipating an assault, the Confederacy prepared a trap, utilizing OG-9 homing spider droids with the intent of destroying the Republic battalion.
The remaining soldiers from K'Kruhk's unit were successful in making their way to the canyon's exit, where they proceeded to destroy the battleship-base.