fur
furlong
Lengthexact by definition
A furlong is exactly 660 feet, 220 yards, ten chains, or 201.168 metres. Eight of them make a statute mile. It survives as the standard distance unit of horse racing in Britain, Ireland and the United States, where race distances are quoted in miles and furlongs.
| 1 fur | 201.168 m |
Where the unit came from
The name is "furrow long", the distance a team of oxen was expected to plough before resting. Medieval fields were laid out in strips one furlong long by one chain wide, which is one acre, and the whole English land system is built on that rectangle.
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