Marathon swimming

Marathon swimming is a class of open water swimming defined by long distances, with 10 kilometers being the unofficially held minimum distance. Routes are typically geographically based or buoy based. Geographical routes include crossings of channels and lakes, circumnavigations of islands, and stretches of coast lines or rivers.

Buoy-routes are mainly found in competition events.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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