An ultra-marathon is a long-distance running event that exceeds the standard marathon distance of 26.2 miles (42.195 kilometers). These races can vary in length, typically starting at 50 kilometers and going up to 100 miles or more. Ultra-marathons can take place on roads, trails, or a combination of both, and they often challenge participants with difficult terrain and varying weather conditions. Runners in ultra-marathons must prepare extensively, as these events require not only physical endurance but also mental resilience. Many ultra-marathons include aid stations along the route, providing food, water, and medical support to help runners complete the race.