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An ultramarathon is a long-distance running race that typically exceeds the standard marathon distance of 26.2 miles. Ultramarathons can vary in distance, with common distances including 50 kilometers, 50 miles, 100 kilometers, and 100 miles. These races are often held on challenging terrain such as trails, mountains, or deserts, requiring runners to possess endurance, mental toughness, and strategic planning. Ultramarathons can be completed as solo efforts or as part of a team relay, and can take anywhere from several hours to several days to finish. Participants in ultramarathons must undergo rigorous training and preparation to handle the physical and mental demands of the race.