Kim Mun (Chinese: 金門方言; also Lanten or Landian 蓝靛) is a Mienic language spoken by 200,000 of the Yao people in the Chinese provinces of Guangxi, Hunan and Yunnan, with about 61,000 of the speakers in Hainan Province.

[2] Ethnologue lists several counties in Vietnam where Kim Mun is spoken.

Van Ban district of Lao Cai province is one of the primary areas where Kim Mun is spoken in Vietnam.

In Vietnam, Dao people belonging to the Quần Trắng, Thanh Y, and Áo Dài subgroups speak Kim Mun.

Daniel Arisawa has performed fieldwork with an isolated speaker of Kim Mun (originally from Laos) in Lampang province, northern Thailand (along the border of Mae Mo district and Ngao district).