The Campeonato Argentino de Mayores is an annual rugby union competition in Argentina for provincial teams. The Campeonato Argentino is strictly amateur, and only players from local clubs are allowed. The competing teams do not represent the 24 political provinces of Argentina, but rather the unions of the rugby provinces that make up the Unión Argentina de Rugby (UAR). Some of these unions represent more than one political province, for example Noreste represents the provinces of Chaco and Corrientes. Other unions may only represent part of a political province, most notably the unions that make up the province of Buenos Aires and also the unions of Santa Fe and Rosario, both within the borders of the province of Santa Fe.