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League is a unit of distance long common in Europe and Latin America, although no longer an official unit in any nation.

The league expresses the distance a person, or a horse, can walk in 1 hour of time.

The league was used by Ancient Rome, which defined it as being 3 miles. The origin is the Persian parasang which came to the Romans via the Greek.

The Spanish League or Legua was originally set as a fixed unit of distance of 5000 varas, about 2.6 miles or 4.2 km. Officially the league was abolished by Philip II of Spain in 1568, but it is still in use unofficially in parts of Latin America, with exact meaning varying in different countries.

In Argentina a league is a distance of 5 km.

In Yucatan and other parts of rural Mexico the league is still commonly used in the original sense of the distance that can be covered on foot in an hour, so that a league along a good road on level ground is a greater distance than a league on a difficult path over rough terrain.

The French liegue exists in several variants, all in the neighborhood of 4 km. Its use overlaps the metric system.

See Historical weights and measures for various definitions of the league.

League (chuulghan in Mongolian) was an administrative unit in Mongolia during the Qing Dynasty. It still exists in Inner Mongolia. A league consisted of several banners. The head of a league was chosen from jasagh or sula of the banners belonging to it.