What is the 2 official in running events?

In running events, the two official distances recognized by major athletic organizations are the marathon, which is 42.195 kilometers (26.2 miles), and the half marathon, measuring 21.0975 kilometers (13.1 miles). These distances are standardized for competitive races and are often featured in major events like the Olympics and various marathons worldwide. Other recognized distances include the 10K and 5K, but the marathon and half marathon are the most prominent in long-distance running.