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In page Furlong:

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In the rest of the world the furlong has very limited use, with the notable exception of horse racing in most English-speaking countries, including Canada and the United States. The distances for horse racing in Australia were converted to metric in 1972[1] and the term survives only in slang.[citation needed] In the United Kingdom,[2] Ireland, Canada, and the United States, races are still given in miles and furlongs. Also distances along English canals navigated by narrowboats are commonly expressed in miles and furlongs.