A Primera División team plays in which city that is located in the Cyuo region of Argentina?
San Martín de San Juan Club Atlético San Martín, mostly known as San Martín de San Juan, is an Argentine football club from the city of San Juan. The team currently plays in the Primera División, the first division of the Argentine football league system.
Primera B Nacional Primera B Nacional (usually called simply "Nacional B", in English "National B Division") is the second division of the Argentine football league system, made up of 25 teams in the 2017–18 season.