Europe is a place on the east Eurasian continent. the Arkfall and the terraformation cause by it created massive changes by modifying the topography and the environment. Now Europe has various ecosystems.
In France, one entire Ark crash into the country releasing all of his cryogenic capacity freezing the country and parts of Switzerland and Italy into ice. The Artifical Intelligence of the ship managed to enslave the population but a resistance group has formed, in hope of being free again. the ice age caused by this crash ark will not last, in some years all of the energy from the ship will be use and the ice will slowly melt away.
The United Kingdom survived the environmental change (but not geological) and it now has an authoritarian government that policies the population.
In Germany, a piece of ark who transport many vegetation sample crash and the country was recovering by jungle forest with very dangerous animals and plants (like carnivorous plants). the old castle meet modern buildings, but the population is ruled by warlords. It's like Pale Wars never end here.