He made a new but faulty calculation of the circumference of the earth (240,000 stades).
For Narnia is only three hundred and fifty stades distant from Rome.
And it is about eighty stades distant from the city of Auximus, whose port it is.
The longer sides were 80, the shorter sides 15, stades in length.
The total length of the three sides will thus be nearly 10,000 stades.