Umoja is a planet in the Koprulu sector.
The Umojans consider themselves to be an enlightened people. Umojans are fiercely independent. Their architecture and technology is known for being highly functional, and the technology has a reputation for being cutting-edge.
The Umojans are known for possessing a small government and lucrative economy.
The Sarengo and the Reagan crash-landed on Umoja. The Sarengo smashed into the planet, killing all of its eight thousand passengers and cleaving a massive canyon into the planet. The Reagan landed safely, and the passengers stripped it of essential materials in an attempt to find refuge in their new surroundings.
The vagabond new inhabitants worked to survive in what they termed 'the New World', making do with whatever meager resources they could find. As they spread across the planet, they quickly adopted a method of fair and democratic governance that later became known as the Umojan Ruling Council. It had a philosophy of leaving nothing to waste, which kept Umoja's flora and fauna unspoiled.
In a relatively short amount of time, the Umojans spread to other worlds and developed a prosperous, self-supporting economy.
A productive period of open communication and trade was born when Umoja first came into contact with Tarsonis and Moria. Although Tarsonis repeatedly pushed Umoja and Moria to join in a conglomerated government, the two colonies steadfastly refused, as they were faced with the likely pre-eminence of Tarsonis in such an arrangement.
The Umojan Ruling Council was immediately wary of the growing influence of the Terran Confederacy. The Umojans harbored obvious contempt for their sister colonies that submitted to its near-fascist yoke.
The Umojan Protectorate
The Umojan Ruling Council saw the outcome of the Guild Wars as utterly abusive. As a result, it held an emergency sitting in 2489 and, upon inviting other nearby independent colonies to join them, formed the Umojan Protectorate with Umoja as its capital world.
Arcturus Mengsk was on Umoja making plans with separatist factions during the bombardment of Korhal. By the time he became Emperor of the Terran Dominion in 2500, he was well known on Umoja. Crown Prince Valerian Mengsk had spent the first seven years of his life on Umoja with Juliana Pasteur.
The relationship had suffered damage shortly thereafter. Dominion capital ships led by General Edmund Duke were told to keep their distance from Umoja when Dominion emperor Arcturus Mengsk paid his son Valerian a visit there. The emperor had to descend to Umoja in an obsolete gun cutter. Shortly after landing, a Confederate Resistance Forces team led by Captain Angelina Emillian attacked, outnumbering the Dominion and Umojan security forces and cutting off communication with the capital vessels. Arcturus Mengsk, Valerian and their war teacher, Master Miyamoto fended off the troops long enough for the Dominion vessels to rescue them – a task made possible only because Duke ignored Umojan instructions to keep away. The Umojans and the Dominion had to renegotiate the movement of Dominion capital vessels after the attack.
The Terran Dominion imposed trade embargoes and made assassination attempts against dissidents pursuing asylum in Protectorate territory in an effort to undermine the sovereignty of Umoja. Fully aware of the Dominion's unparalleled military might, the Umojan Ruling Council embarked on a more covert route to uphold its independence. Its members debated whether or not the Dominion would ever make more forceful moves against Umoja. Regardless, they unanimously agreed to continue their subversive activities and were prepared to take any action necessary to preserve the freedom of Umoja.
- Sarengo Canyon (restricted zone)
- Spy Deck (part of an orbital installation)
- Umoja Central University
- Umoja Institute
Heart of the Swarm beta files indicated that Umoja would appear in Heart of the Swarm, but while a Protectorate planet appeared, Umoja itself remained absent. Late in the game, Sarah Kerrigan says that Valerian has "done some growing up since Umoja", perhaps a holdover from the script in which Umoja appeared.