Vietnam was a country in Asia.
During the 2012 apocalypse, Vietnam was hit by massive earthquakes which caused several of its cities to descend into global chaos. Millions of people in Vietnam were killed, while some survivors realised that the world is coming to an end before gathering in public places in desperate prayer, thinking that nothing will save them. Vietnam was then later swept by a megatsunami in the Worldwide Flooding.
As a result of the apocalypse, Vietnam is left with extreme damage from the disasters and is rendered uninhabitable.