Primera B Metropolitana is one of two leagues that form the regionalized third level of the Argentine football league system. The other league at level three is the Torneo Federal A. Originally created as the second division, it became the third level after a restructuring of the system in 1985 that ended with the creation of Primera B Nacional, set as the second division since then. Primera B Metropolitana is made up of 20 clubs mainly from the city of Buenos Aires and its metropolitan area, Greater Buenos Aires.