What is the standard unit of measurement between “football pitch” and “Wales”

[BathshebaKnickerStickers]

You know the REAL standard units of measurement.....

Human hair
Double decker bus
Football pitch....

Well the biggest standard unit of measurement is “the size of Wales”... but what comes between “the size of a football pitch” and “the size of Wales”...

Often things cover ‘an area the size of belgium’. But that’s the next one up from Wales.
I don’t think there is one between the football pitch and wales.