Pan-Ur (also known as Proto-Ur, in some cases) is a prototype landmass of Ur that formed around 4.1 Gya (billion years ago). It includes all of the Paleoarchean continent of Ur except for East Antarctica and the Yilgarn craton.

The only ocean surrounding the Pan-Ur was the Proto-Vishnuan sea. The only other bodies of water and heat were Indva's Swamp and the Proto-Vishnuan seaway.