Third colonized moon of Saturn, and closer to the E-Ring moon Enceladus, the first settlement was in the Odysseus impact crater. Tethys as selected after Dione to further mining operations from the E-Ring and geysers of Enceladus. While the E-Ring moon travels much faster than both Tethys and Dione, its closer proximity made Tethys ideal to continue this endeavor.

Pactolus Station is the largest city on Tethys, located in the Odysseus crater's southern portion. This is relative to the quadrangles of Tethys from long ago, it is in the Polycaste Quadrangle, close to the equator of Tethys.

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