Rev 21:16

16 The city lies foursquare, and its length is as great as its breadth. He measured the city with the reed, twelve thousand stadia. Its length, breadth, and height are equal.

as a square – all sides are equal, there is neither male nor female, Greek nor Jew.

fifteen hundred miles square – more than 3 times the size of Russia. The Greek word used is “stadia” from which we get “stadium.” It is 1/8 of a mile. Literally 12,000 stadia, or 1,500 miles.