(1) a group of cities special economic zone at the border of Mae Sai, Chiang Rai: Chiang Saen must accelerate development of both infrastructure and core infrastructure elements.
(1) the city's exclusive economic zone border: Mae Sai, Chiang Saen need to accelerate the development of urban infrastructure and major infrastructure components.
(1) the City Special Economic Zone, the border: Chiang Saen. Sai, Chiang Khong. To accelerate the weight of urban infrastructure and infrastructure elements .