San Marino was a country in Europe.
During the 2012 apocalypse, San Marino was hit by massive earthquakes which caused several of its cities to descend into global chaos. Millions of people in European countries realised that the world is coming to an end before gathering in public places in desperate prayer, thinking that nothing will save them. Along with the rest of Europe, San Marino was then later swept by a megatsunami in the Worldwide Flooding.
As a result of the apocalypse, San Marino is left with extreme damage from the disasters of the apocalypse and is rendered uninhabitable. However, when most of Europe (And Italy) rose above the sea, It is presumed that San Marino became habitable although it is unknown.