25-tonne stones for 18km in case you wondered
Or 3928 stone stones
https://en.wikipedia.org/wiki/Stone_(unit)
For anyone confused, British people would generally use tonnes (or tons, but maybe not know the difference exactly) and miles.
Or about 3 double-decker buses for the length of 171 footy pitches.
Or 3928 stone stones
https://en.wikipedia.org/wiki/Stone_(unit)