Mustafar
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Mustafar was a volcanic planet that was mined by the CIS during the Clone Wars. The Separatists set up a state-of-the-art facility there to protect its leaders from the wrath of the Republic, although they were eventually hunted down, and destroyed by Anakin Skywalker anyway.
Mustafar was the planet that Obi-wan fought Anakin and defeated him.
