The planet Rannoch, an arid planet orbiting an older star in the Tikkun system, is the former quarian homeworld. Almost three hundred years ago, the quarians were driven from Rannoch by the geth, synthetic servants who gained sapience, fearing a revolt, the Quarian government at the time attack them, only to fail and forced off-world. Although Rannoch is now largely uninhabited, the geth have acted as caretakers, working to repair the planet's ecology, restore ancient structures, and cultivate some farmland.

During the First Mul;tiverse War, Rannoch was one of four planets (the others being Palaven, Tuckanka and Earth) where the Citadel Alliance placed a defense at, but as the months passed, the Citadel Alliance was forced to retreat from the planet, even with Geth help, in an event now called the Fall of Rannoch.

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