Several pre-War countries are mentioned throughout the Fallout series. Several banded together into international organizations, such as the European Commonwealth or the United Nations, both of which failed by the time of the Great War.
The world map in federal surveillance center K-21B and on the globe in Fallout 4 shows several bodies of water such as the Mediterranean Sea depicted as the same color as landmasses. It is possible that the map used in-game is a modified version of one from Wikimedia Commons, representing the real world circa 2004 and an error occurred while using the fill tool in a photo-editing program, causing the aforementioned filled-in bodies of water.[Non-game 1] The world map at the Whitespring bunker in Fallout 76 does not feature this fill-in.
↑Kaisa's character description: "{Kaisa is the last in a long line of gorgeous blonde Fins . Her family was famous for their mobile phones and delicious pastries. Kaisa continues this tradition by being an expert with high tech equipment, but her cooking skills are totally unappreciated.}"