Primera B Nacional (usually called simply Nacional B, in English National B Division) is the second most important category of Argentine football organized by the Argentine Football Association.
It is played by teams from all over the country. Clubs from Buenos Aires surroundings, as well as some from Santa Fe province, are promoted from or relegated to the Primera B Metropolitana (Metropolitan B Division) while for teams from the other provinces the Torneo Argentino A (Argentine A Tournament) is the next level down. In the league system of Argentine football, Nacional B is the second-highest league, and from it the two best team are automatically promoted to Primera División Argentina while the 3rd and 4th ranked teams played promotion/relegation playoffs against the 17th and 18th Primera Division teams.
Read more about Primera B Nacional: History, Format, 2012–13 Season Teams, Champions, Titles By Clubs