A league is a unit of distance that is traditionally used to measure the distance a person can walk in one hour. It is commonly defined as approximately 3 miles or 4.8 kilometers. The term originated from the medieval period and was often used in maritime contexts to describe distances at sea. In modern usage, the league is not commonly employed in everyday measurements, as the metric system and other units like miles and kilometers are more prevalent. However, it remains a part of historical literature and is sometimes referenced in discussions about geography or navigation.