Shanghai was a city in China. It was one of the country's most famous cities.
Although, it was not seen nor mentioned, but it is mentioned that Shanghai was hit by massive earthquakes during the 2012 apocalypse, that took place on December 21st 2012. Shanghai, along with Japan 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