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Ocean's Seven consists of seven long-distance open-water swims, and is considered the marathon swimming equivalent of the Seven Summits mountaineering challenge. It includes the North Channel, the Cook Strait, the Molokai Channel, the English Channel, the Catalina Channel, the Tsugaru Strait and the Strait of Gibraltar. 
The Ocean's Seven has been completed by five people: Stephen Redmond (Ireland), Anna-Carin Nordin (Sweden), Michelle Macy (United States), Darren Miller (United States) and Adam Walker (United Kingdom).
An alternative definition of the Ocean's Seven is one channel from each of the seven continents, just as the Seven Summits refers to the highest summit on each of the seven continents. For this definition, the list would include a South American channel and a swim in Antarctica. For example, Lynne Cox has swum channels in 6 continents and swam for 25 minutes in Antarctica.
- "Open-ocean swimmer Adam Walker: 'Hardest swim of my life'". BBC News. BBC. 11 September 2013. Retrieved 2013-09-11.
- Sataline, Suzanne (2010); Extreme Swimmers Accept the Challenge of 'Ocean's Seven' ; Wall Street Journal. Retrieved October 16, 2010. http://online.wsj.com/article/SB10001424052748704300604575554071845163744.html
- O'Connell, Hugh (2012); Irish swimmer completes gruelling open water challenge; TheJournal. Retrieved February 20, 2014. http://www.thejournal.ie/steve-redmond-open-water-challenge-oceans-7-japan-cork-swimmer-endurance-521509-Jul2012/