Lan–Yin or Lanyin is a dialect of Mandarin Chinese traditionally spoken throughout Gansu

Gansu

' is a province located in the northwest of the People's Republic of China.It lies between the Tibetan and Huangtu plateaus, and borders Mongolia, Inner Mongolia, and Ningxia to the north, Xinjiang and Qinghai to the west, Sichuan to the south, and Shaanxi to the east...

 province and in the northern part of Ningxia

Ningxia

Ningxia, formerly transliterated as Ningsia, is an autonomous region of the People's Republic of China. Located in Northwest China, on the Loess Plateau, the Yellow River flows through this vast area of land. The Great Wall of China runs along its northeastern boundary...

. In recent decades in has expanded into northern Xinjiang

Xinjiang

Xinjiang is an autonomous region of the People's Republic of China. It is the largest Chinese administrative division and spans over 1.6 million km2...

.

The name is a compound of the capitals of the two provinces where it dominates, Lanzhou

Lanzhou

Lanzhou is the capital and largest city of Gansu Province in Northwest China. A prefecture-level city, it is a key regional transportation hub, allowing areas further west to maintain railroad connections to the eastern half of the country....

 and Yinchuan, which are also two of its principal subdialects.

Among Chinese Muslims

Hui people

The Hui people are an ethnic group in China, defined as Chinese speaking people descended from foreign Muslims. They are typically distinguished by their practice of Islam, however some also practice other religions, and many are direct descendants of Silk Road travelers.In modern People's...

, it is sometimes written in the Arabic alphabet.

Sub-dialects

• Lanzhou dialect 兰州话/蘭州話
• Urumqi dialect
• Xining dialect 西宁话/西寧話
• Yinchuan dialect 银川话/銀川話