Regional 1 South West (formerly South West Premier and National League 3 South West) is a level five league in the English rugby union system. It is one of six leagues at this level. When this division began in 1987 it was known as South West Division 1. The format of the league was changed at the beginning of the 2009–10 season following reorganisation by the Rugby Football Union, and the name change from National League 3 to South West Premier was introduced for the 2017–18 season by the RFU in order to lessen confusion for what is a series of regional leagues. Regional 1 South West, is the highest regional rugby union league covering South West England. The club finishing in first place is automatically promoted to National League 2 West. Relegated teams drop down to either or Regional