The 21K takes place over the distance of 21.1 kilometres (or 13.1 miles). This type of race is one of the most popular road race events, with tremendous growth in participation in the last few years. It is really common for a 21K to be incorporated in a standard full marathon as a stand alone event. This way it provides a feeder system for the 42.2km full marathon. The events shown below all have a standard 21.1km road distance event.