Language Atlas of China
According to the "Language Atlas of China", Northern Min varieties are spoken throughout the counties of Wuyishan (formerly Chong'an), Jianyang, Jian'ou, Zhenghe and Songxi, in the southern part of Pucheng County and the northeastern part of Shunchang County, and in Yanping District except for the Nanping dialect of the urban area of Nanping, which is an island of an isolated Mandarin dialect of uncertain affinity.