People looking at maps are usually more interested in the land forms than they are in the vast flat oceans. [The geographic center of land on Earth is in Turkey](https://en.m.wikipedia.org/wiki/Geographical_centre_of_Earth) and splitting the map through the middle of the Pacific puts Turkey pretty close to the center of the map while minimizing the amount of land that has to be split.
Occasionally you’ll of course find places that split the map other ways to focus on their own regions. You can for example find many Asiacentric maps in Asia.
Latest Answers