Estonia was a country in Europe and it's capital city was Tallinn.
During the 2012 apocalypse, Estonia was hit by massive earthquakes when the tectonic plates destabilized, wrecking several cities and killing numerous people living in the country. Estonia was then swept by a mega tsunami in the Worldwide Flooding.
After the apocalypse ended, Estonia is left with extreme damage from the earthquakes, volcanic eruptions and tsunamis. However, when the global floodwaters started to recede, Estonia had presumably risen and had become partially habitable.
The only survivor is the Estonian Prime Minister and some elitist citizens