Wiang Kaen is the easternmost district of Chiang Rai Province, northern Thailand.HistoryHistorically, the area was Mueang Wiang Kaen, on the Ngao river bank. It was founded in the same time of Sukhothai kingdom and Chiang Rai.The government separated the three tambon Muang Yai, Po and Lai Ngao from Chiang Khong district to create a minor district on 1 April 1987. It was upgraded to a full district on 7 September 1995.GeographyNeighboring districts are Thoeng, Khun Tan, Chiang Khong of Chiang Rai Province. To the east lies Bokeo Province province of Laos.1,442 m high Phu Chi Fa lies at the border with Thoeng District.AdministrationThe district is divided into four sub-districts, which are further subdivided into 41 villages . There are no municipal areas, and four tambon administrative organizations .