Tui Regio (Titan)

Chinese goddess of happiness, joy, and water.

Tui appears to lack the erosion channels that mark other highland regions on Titan, suggesting it may be geologically young. Patterns resembling lava flows have also been observed, suggesting cryovolcanism. (wikipedia entry)

A regio is a large area marked by reflectivity or color distinctions from adjacent areas, or a broad geographic region. On Titan they are named after deities of happiness, peace, and harmony from world cultures.