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Because it happens in London
The one in Paris in called the Paris marathon
The marathon will start (and finish) at the Mall in Cnetral London, making the marathon a loop.
New York City Marathon was created in 1970.
The London Marathon is a road marathon that has been held each year in London since 1981.
The race length of the London Marathon is 42.195 kilometers. Its actually 26.219 miles as its in London :p