The Greater Mekong Subregion comprises Cambodia, the People's Republic of China (specifically Yunnan Province and Guangxi Zhuang Autonomous Region), Lao People's Democratic Republic , Myanmar, Thailand, and Viet Nam.

In 1992, with assistance from the Asian Development Bank (ADB), these six countries entered into a program of subregional economic cooperation, designed to enhance economic relations. With support from ADB and other donors, the Greater Mekong Subregion Economic Cooperation Program supports the implementation of high-priority subregional projects in agriculture, energy, environment, health and human resource development, information and communication technology, tourism, transport, transport and trade facilitation, and urban development.