Revelation 21:13-16

There were three gates on each side—east, north, south, and west. The wall of the city had twelve foundation stones, and on them were written the names of the twelve apostles of the Lamb. The angel who talked to me held in his hand a gold measuring stick to measure the city, its gates, and its wall. When he measured it, he found it was a square, as wide as it was long. In fact, its length and width and height were each 1,400 miles.