Un Hareth

 was a volcanic planet located in the Mustafar system.

History
In the Late Clone Wars Jedi Knight Anakin Skywalker found this planet with the 501st and took control of it, days later the CIS wanted another planet to control under Count Dooku but they found out the Republic hade controlled it first, then a war came to the planet, but the Republic could not hold their lines, so the Republic failed to keep the planet under their control, so it was then controlled by the CIS.