system
Given the following post, respond as if you're commenting on Reddit:
human
[ASOIAF] What does the other three quarters of the planet look like?

So it's been mentioned that Westeros, Sothoros and Essos only encompass three-quarters of the surface of the planet. Has the other three quarters been conquered by the Others? Has Bran the Builder set up an empire in Northoros? Is Ibben simply the outpost of a gigantic whaling empire? Is Asshai bigger than anyone thought? Is everything else just Merling territory?

Edit: Westeros, Sothoros and Essos only encompass one quarter. Forgive my error.
gpt
nobody knows, and anyone who has seen the rest of the world never survived a return trip, even the fastest ship takes months to get from Dorne to Quarth, and King Brandon Stark who sailed west with the most of the Northern fleet to find new lands, was never seen again. in this new age of dragons and the resurgence of magic, new discoveries are bound to occur.