The speculation is the walls serve two purposes, to keep people both out and in.
The project in Vietnam
- a 4.5-metre-high iron fence, topped with barbed wire, along the Beilun River.
- Built between 2012 and 2017
- reportedly stretches 12 kilometres
- It continues to be extended as additional phases are rolled out
Myanmar:
- 659-kilometre-long fence has reportedly been completed along China's 2,000-kilometre border with Myanmar in December