An ultramarathon is any running race longer than a standard marathon distance of 26.2 miles (42.195 kilometers). Unlike marathons, which have a fixed distance, ultramarathons vary widely in length. Common ultramarathon distances start at 50 kilometers (about 31 miles) and include 50 miles (80.5 km), 100 kilometers (62 miles), and 100 miles (161 km). Some ultramarathons extend well beyond 100 miles, including multi-day events that can cover several hundred miles or more
. Ultramarathons can also be timed events, such as 6, 12, 24, or 48 hours, where runners cover as much distance as possible within the set time
. The longest certified footrace is the Self-Transcendence 3100 Mile Race, which covers 3,100 miles and takes participants around 40-50 days to complete
. In summary, an ultramarathon is any race longer than 26.2 miles, with typical distances ranging from 50 km to over 100 miles, and some races lasting several days or covering extraordinary distances.
