Parallel
Ezekiel 43:16
Brenton's English Septuagint · Berean Standard Bible
And the altar [shall be] of the length of twelve cubits, by twelve cubits [in breadth], square upon its four sides.
The altar hearth shall be square at its four corners, twelve cubits long and twelve cubits wide (note: 12 (long) cubits is approximately 21 feet or 6.4 meters.).