Longchuan County (simplified Chinese: 陇川县; traditional Chinese: 隴川縣; pinyin: Lǒngchuān Xiàn; Tai Nüa: ᥔᥦᥢᥱ ᥛᥫᥒᥰ ᥝᥢᥰ; Jingpho: Nshon Ginwang; Thai: เมืองวัน) is a county located in Dehong Prefecture, Yunnan province, southwestern China.

The county seat is in Zhangfeng Town (章凤镇).

[2] Many citizens of Dehong Prefecture belong to the Jingpo-nation ethnic group, an official minority in the People's Republic of China.

They are one and the same as the people of Kachin State, the adjacent part of Myanmar, and ethno-linguistic ties are strong.

Möng Wan was the commumicate of Tai people since more than 1,000 years ago in 1384 the formal first saopha was established here the first ruler come from Möng Mao but in 1441 Kawng Chai, the local Tai people made coup état to the descendants royal from Möng Mao and established himself to be saopha instead the original lineage, they have 28 saophas who were descendants from Kawng Chai to mid of 1900s This Yunnan location article is a stub.