“Dura” means a circle

Dura: the plain where Nebuchadnezzar set up the golden image, (Daniel 3:1) has been sometimes identified with a tract a little below Tekrit , on the left bank of the Tigris, where the name Dur is still found. M. Oppert places the plain (or, as he calls it, the "valley") of Dura to the southeast of Babylon, in the vicinity of the mound of Dowair or Duair , where was found the pedestal of a huge statue.