Shanghai was a large city in China. It was one of the country's most famous cities. It was the most popolous city in the same country.
Although, it was not seen nor mentioned, Shanghai was devastated by massive earthquakes during the 2012 apocalypse that took place on December 21, 2012.
Shanghai, along with the rest of China and the rest of Asia was then swept by a megatsunami during the Worldwide Flooding. As a result of the apocalypse, Shanghai is destroyed, left with extreme damage and is rendered uninhabitable.
- Shanghai at Wikipedia