Korriban

Title: Crimson Landscape (Korriban)
The Sith Empire was founded in 6900 BBY by exiled fallen Jedi fleeing the Battle of Corbos, which concluded the Hundred-Year Darkness.
The fallen Jedi landed on Korriban. After the Hundred-Year Darkness, the remaining Dark Jedi interbred with the Sith species and ruled the Sith using their Force powers. After the Great Hyperspace War,
Korriban was abandoned and became a barren world. It was the site of a Sith Academy and became the headquarters of the One Sith.