What is the name of the lava planet where Obi-Wan duels Anakin?

The story behind the answer

The climactic duel at the end of Revenge of the Sith unfolds on a lava-choked industrial world, its rivers of magma and perilous mining platforms defining the battleground. Don’t confuse it with Geonosis (the sandy arena world from Attack of the Clones), Sullust (a volcanic Rebel staging area not tied to this duel), or Korriban/Moraband (the ancient Sith tomb world).

This planet was the Separatists’ final refuge, where Anakin—newly christened Darth Vader—eliminated their leaders before facing Obi-Wan. The infernal setting mirrors his moral descent and leaves him grievously injured, prompting the life-sustaining armor. Filmmakers enhanced the sequence with real eruption footage from Mount Etna, and the site later became home to Vader’s fortress in Rogue One and other media.