Marathon from the start at Windsor Castle to the royal entrance to the White City Stadium, followed by a lap (586 yards 2 feet; 536 m) of the track, finishing in front of the Royal Box. The course was later altered to use a different entrance to the stadium, followed by a partial lap of 385 yards to the same finish. The modern standard distance for the marathon was set by the International Amateur Athletic Federation (IAAF) in May 1921 directly from the length used at the 1908 Summer Olympics in London. An official IAAF marathon course is 42.195 km (42
Swimming at the 2012 Summer Olympics – Women's marathon 10 kilometre water marathon at the 2012 Olympics featured a field of 25 swimmers: Swimming at the 2012 Summer Olympics – Women's marathon 10 kilometre The women's marathon swimming over a distance of 10 kilometres at the 2012 Olympic Games in London took place on 9 August in the Serpentine at Hyde Park in London, United Kingdom. Hungary's Éva Risztov ended her eight-year absence from Olympic action to capture the women's 10 km marathon title in open water swimming. Leading most of the stretch in a grueling race, she held off a late resistant surge from American teen Haley Anderson on the