The River of Origin existed on the world of Kashyyyk, a planet in the galaxy. Following the execution of Order 66, the one-time Jedi Padawan, Cal Kestis, seized an Imperial All Terrain Armored Transport. This occurred while the AT-AT was traversing the river, amidst a battle with Saw Gerrera's group of Partisans. This event took place at some point in time after the aforementioned Order.