Convert yard (spanish) to league

Gunter's chain of 1620 tied land measure to the acre: a chain is 66 ft or 100 links, 10 chains make a furlong (the length of a furrow), 8 furlongs a mile, and an acre is one chain by one furlong. Rods (16½ ft, a quarter chain) and chains still appear in US and Canadian deeds, and furlongs in horse racing. The US survey foot, 1200/3937 m, differs from the international foot by two parts per million, which adds up over a state; it was retired for new work on 1 January 2023, though survey data and legal descriptions in survey feet remain.

The vara of Burgos, 0.8359 m, was Spain's standard yard from 1801 until the metre replaced it; it divided into 3 pies (feet), 36 pulgadas (inches), 432 líneas and 5,184 puntos, and a paso (pace) was 5/3 of a vara. The vara travelled to the colonies and was fixed differently in each: 0.838 m in Mexico, 0.866 m in Argentina, and 33⅓ inches (0.847 m) in Texas and California, where old land grants are still described in varas.