The Welsh Rugby Union Division One North (also called the SWALEC Division One North for sponsorship reasons) is a rugby union league in Wales first implemented for the 1995/96 season.
During the course of a season (which lasts from September to April) each club plays the others twice, once at their home ground and once at that of their opponents for a total of 22 games for each club, with a total of 132 games in each season.
The team who is declared champion at the end of the season but is not allowed promotion out of the Division One North league.
The two lowest placed teams are relegated into the WRU Division Two North.
[1] The sponsorship is a three-year deal that will continue until the 2010/11 season at a cost of £1 million (GBP).