Ur was an ancient city-state (PROSE: Timewyrm: Genesys [+]Loading...["Timewyrm: Genesys (novel)"]) in lower Mesopotamia.
In 1924, River Song took a boat to Ur on the way to a Surene tomb in the area. (AUDIO: The Boundless Sea [+]Loading...["The Boundless Sea (audio story)"])