Houston

Houston was a city on the south coast of the United States. (TV: The End of Time)

The mission control for the Bowie Base One mission was located in Houston. (TV: The Waters of Mars)

A map showing the location of Houston appeared on a screen at UNIT HQ in Geneva. (TV: The End of Time)

Location information

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Though it's possible that a real world location doesn't exist in the same geographic space in the Doctor Who universe, such cases are few and far between. Thus, the map at right is probably a good indicator of the DWU location of Houston.