“And the city lieth foursquare, and the length is as large as the breadth: and he measured the city with the reed, twelve thousand furlongs. The length and the breadth and the height of it are equal.”
King James Version (KJV)
Re 21:16 And the city lieth foursquare. It is regular and symmetrical. And he measured the city with the reed, twelve thousand furlongs. I suppose that these vast dimensions, a number twelve times one thousand, both favorite Hebrew numbers, are intended to indicate the vastness of the city, rather than its exact size.