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A marathon is officially 26.219 miles (42.195 kilometers) long. This distance was established by the International Association of Athletics Federations (IAAF) as the standard length for marathon races in 1921.

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A marathon is officially 26.219 miles (42.195 kilometers) long. This distance was established by the International Association of Athletics Federations (IAAF) as the standard length for marathon races in 1921.

The origin of the marathon distance is linked to the legend of a Greek soldier named Pheidippides, who ran from the battlefield near Marathon to Athens to announce the Greek victory over the Persians in 490 BC. While the exact distance he ran is uncertain, it is believed to have been around 25 miles, and the marathon distance was chosen to commemorate this legendary feat.

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