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There are 26.2 miles in a full marathon, thus there are 13.1 miles in a half marathon. No odd calculations... a half marathon is a half marathon.
Yes, there is a half marathon. A half marathon is about 13.1 miles long, half the distance of a full marathon, 26.2 miles.
Egmond Half Marathon was created in 1973.
Portugal Half Marathon was created in 2000.
Budapest Half Marathon was created in 1984.