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A vara (meaning "rod" or "pole", abbreviation: var) is an old Spanish unit of length. Varas are a surveying unit that appears in many deeds in the southern United States, and varas were also used in many parts of Latin America. It varied in size at various times and places; the Spanish unit was set at about 835.905 mm (32.91 in) in 1801. In Argentina, the vara measured about 866 mm (34.1 in), and typical urban lots are 8.66 m (28.41 ft) wide (10 Argentine varas). At some time a value of 33 inches (838.2 mm) was adopted in California. In Texas, a vara was defined as 33+1⁄3 inches (846.67 mm), or 1 yard = 1.08 vara. The vara and the corresponding unit of area, the square vara, were introduced in the 19th century to measure Spanish land grants. In Texas, Stephen F. Austin's early surveying contracts required that he use the vara as a standard unit. The vara can be seen in many deeds as late as the mid to late 1900's. An 1 acre (0.405 ha) is equivalent to 5,645.376 Texan square varas. A league is equivalent to 5,000 varas squared or 4,428.4 acres (1,792.11 ha). A league can also be a unit of area, used to express the area of land, that is equal to 25 million square varas. A (square) league is equivalent to about 4,428.4 acres (1,792.11 ha). It was used in the archaic system of old Spanish land grants affecting Texas and parts of adjoining states and this use of league is used throughout the Texas Constitution. Although some standardisation was achieved with the law of 1801, particularaly in defining the league as 6666⅔ varas long, varying measures continued to be used in various cities and regions.