Lan–Yin Mandarin (Lanyin) is a dialect of
Mandarin Chinese traditionally spoken throughout
Gansu province and in the northern part of
Ningxia. In recent decades it has expanded into northern
Xinjiang. It forms part of Central Mandarin (中部官话) with
Central Plains Mandarin (中原官话). The name is a compound of the capitals of the two former provinces where it dominates,
Lanzhou and
Yinchuan, which are also two of its principal subdialects.