ultramarathon Directory References Contents Ask the Chatbot a Question ultramarathon race Ask the Chatbot a Question Learn about this topic in these articles:development of marathons In marathonUltramarathons, which are neither Olympic nor World Athletics events, are longer races based on a specific distance or an allotted time period for competition, such as a 12-hour race. Read More Britannica ChatbotChatbot answers are created from Britannica articles using AI. This is a beta feature. AI answers may contain errors. Please verify important information using Britannica articles. About Britannica AI.
