Use this tag to refer to a sport which consists of running and hiking over trails. In the United Kingdom and Ireland it is called mountain or fell running. It differs from road running and track running in that it generally takes place on hiking trails, often in mountainous terrain, where there can be much larger ascents and descents.

Trail running is a sport which consists of running and hiking over trails. In the United Kingdom and Ireland it is called mountain or fell running. It differs from road running and track running in that it generally takes place on hiking trails, often in mountainous terrain, where there can be much larger ascents and descents. It is difficult to definitively distinguish trail running from cross country running. In general, however, cross country is an IAAF governed discipline that is typically raced over shorter distances (rarely over 12 kilometers), whereas trail running is loosely governed, and run over longer routes.

From Wikipedia - Trail Running

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