Expedition swimming (noun): Swimming in natural or man-made bodies of open water including oceans, lakes, rivers, bays and reservoirs, together with teammates or swim buddies, usually as part of a guided tour with or without escorts. The swimmers enjoyed their expedition swim where they encountered many dolphin on their first day. Synonyms: wild swimming, open water swimming, free swimming.
Definition excerpt from the Open Water Swimming Dictionary (English version 2009).
Photo of swimmers exploring the Irish water around Sandycove Island.
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