A furlong is a measure of distance in imperial units and U.S. customary units. It is equal to one-eighth of a mile or 660 feet or 201.168 metres.

Five furlongs are approximately 1 kilometre (1.00584 km to be exact). Since the original definition of the metre was one-quarter of one ten-millionth of the circumference of the Earth (along the great circle coincident with the meridian of longitude passing through Paris), the circumference of the Earth is about 40,000 km or about 200,000 furlongs.

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Extract fron Wikipedia definition here Wikipedia:Furlong

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