system
Given the following post, respond as if you're commenting on Reddit:
human
[ASOIAF]What lies beyond the Sunset Sea?
gpt
Probably a continent equivalent to the Americas. There are four confirmed continents in the ASOIAF world: Westeros, Essos, Sothoros and Ulthos. Westeros is obviously equivalent to Europe and Essos to Asia. From in-universe sources, Sothoros is a savage and wild land filled with jungles and plagues; both this and its geographical position are reminiscent of Africa. Ulthos is a small continent/big island far, far to the east, close to Asshai; that's Australia. So the four known continents cover four continents of our own world, leaving only the Americas to continue the analogy.

Additionally, it's rumoured that there's a golden paradise beyond the Sunset Sea. House Farwynd of the Lonely Light (an ironborn house) believes they can lead the ironborns to this land, and Brandon the Shipwright of House Stark once sailed to the west in search of this paradise, never to return.