The planet Umbara, informally known as the Shadow World due to the rays of its sun never completely reaching its surface, was a perpetually dark planet within the reaches of the Ghost Nebula. It was home to the Umbarans, a species of pale Near-Humans. It was also the site of a large battle during the Clone Wars.
Umbara was part of the Galactic Republic from that government's earliest days.
The founder of the New Sith Empire, Darth Ruin, was an Umbaran and his homeworld was under Sith control by 1002 BBY, when the Brotherhood of Darkness operated a Sith academy on the world that specialized in the training of Sith assassins known as the Umbaran Shadow Assassins. These assassins used the Force to mask their presence from others, this worked even against Sith Lords and Jedi Masters. The primary weapon of these assassins was the Force pike.
During the Clone Wars, Senator Mee Deechi represented the planet in the Galactic Senate and fellow Umbaran Sly Moore worked as Supreme Chancellor Palpatine's Staff Aide. Later in the war, Umbara joined the Confederacy of Independent Systems following the assassination of Deechi and the Republic's clone troopers led an invasion to retake the planet. Since many Umbarans served as spies for the Galactic Empire, after the Battle of Endor most of them retreated back to Umbara, fearing retribution. The planet remained isolated even after the Swarm War, though many predicted the Umbarans would eventually seek to establish a presence in the Galactic Alliance Senate.
- Star Wars: The Old Republic (Mentioned only)
- Darth Bane: Path of Destruction (Mentioned only)
- Darth Bane: Rule of Two (Mentioned only)
- Star Wars: The Clone Wars – "Darkness on Umbara" (First appearance)
- Star Wars: The Clone Wars – "The General"
- Star Wars: Clone Wars Adventures – "Battle of Umbara"
- Star Wars: The Clone Wars – "Plan of Dissent"
- Star Wars: The Clone Wars – "Carnage of Krell"
- Star Wars: The Clone Wars – "The Gathering" (Appears in flashback(s))
- The Clone Wars: Darth Maul: Shadow Conspiracy (Mentioned only)
- Star Wars: The Clone Wars – "An Old Friend" (Appears in flashback(s))
- Riptide (Mentioned only)
- Star Wars: Attack of the Clones The Visual Dictionary (First mentioned)
- Ultimate Alien Anthology
- Inside the Worlds of Star Wars: Attack of the Clones
- The New Essential Guide to Alien Species
- The Essential Atlas
- Galaxy of Intrigue
- "Animated Discussion"—Star Wars Insider 130
- "Super Trooper"—Star Wars Insider 130
- "Notes from the Front Line"—Star Wars Insider 132
- The Essential Guide to Warfare
- Star Wars: The Ultimate Visual Guide: Updated and Expanded
- "10 Amazing Moments from Star Wars: The Clone Wars: Season Four"—Star Wars Insider 134
- "100 and Counting"—Star Wars Insider 139
- Star Wars: Edge of the Empire Core Rulebook
- (First identified as Shadow World)