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 23 teams in the 2016–17 season.
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 Federal A ("Federal 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 three best teams are automatically promoted to Primera División.
For the 2016–17 season, the twenty-three participating teams played each other twice for a total of forty-six matches. Teams received three points for a win, one point for a draw, and no points for a loss. Teams are ranked by total points.
The champion and runner-up teams automatically promoted to Primera División. Four teams were relegated at the end of the season.
Source: www.afa.org.ar
