Convert from arpent [Canada] to span

Unit Definition (arpent [Canada])
The Arpent is a traditional unit of distance in French-speaking nations. It was used as a land measurement, which is the reason for 'Arpentage' becoming the French word for surveying.

Unit Definition (span)
Span is the width of a human hand, from the tip of the thumb to the tip of the pinky finger.