Great Ocean

The Great Ocean is the large body of water that occupies the entire western reaches of the world. It is split into three unofficial areas- Great Ocean North, Great Ocean Central and Great Ocean South. As of yet, it is still mostly uncharted. Sailors who have left to chart it often never return. It is not known what else lies beyond the ocean, if anything.
Many believe that if a sailor sails far enough west, he will actually sail into space. Others believe that there are mysterious lands to the west, and that if a person sails in that direction, they will eventually come upon these lands. Others believe that there are no landmasses to the west, and that if one sails west long enough, they will eventually cross the globe and wind up on the eastern coast of the Shou Empire.