Kanan is on board Governor Tarkin's Star Destroyer, the Sovereign. It's still here above Lothal... but it's scheduled to leave soon."
"Where to?"
"The Mustafar system? I've never heard of it.
Sabine Wren and Hera Syndulla, discuss Kanan's location[src]

The Mustafar system was a star system in the Outer Rim. It contained the volcanic planet of Mustafar.


Season One