Marathon swimming is a long-distance swimming discipline that typically involves swimming distances of 10 kilometers (6.2 miles) or more in open water. This sport can take place in oceans, lakes, or rivers, and it often features various conditions such as waves, currents, and varying temperatures. Swimmers must rely on their endurance, technique, and navigation skills to complete the course. Competitions in marathon swimming can be individual or relay events, and they are governed by organizations like FINA (Fédération Internationale de Natation). Athletes often train for months to build stamina and prepare for the physical and mental challenges of long-distance swimming.