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The furlong is an imperial unit of length.

\(\displaystyle \) \(\) \(\displaystyle 1\) furlong
\(\displaystyle \) \(=\) \(\displaystyle 10\) chains
\(\displaystyle \) \(=\) \(\displaystyle 40\) rods, poles or perches
\(\displaystyle \) \(=\) \(\displaystyle 220\) yards
\(\displaystyle \) \(=\) \(\displaystyle 660\) feet
\(\displaystyle \) \(=\) \(\displaystyle 201 \cdotp 168\) metres

Linguistic Note

The word furlong derives from the old English furh lang, meaning furrow long.

The terms arise from the days of ploughing in mediaeval times.

The furlong was the length of a single furrow, which stretched the whole width of one of the acres into which the land was divided.