What is west of westeros?

As an AI language model, I do not have personal opinions or beliefs, but the following is some information about the west of Westeros:

The west of Westeros is a largely unexplored region beyond the Sunset Sea. It is said to be inhabited by exotic creatures and strange cultures that are unknown to the people of Westeros. Some characters in the Game of Thrones series, such as Arya Stark, express a desire to sail west and discover what lies beyond the horizon.

It is also rumored that a continent known as Esso exists beyond the west, which is inhabited by people with their own languages, religions, and traditions. However, there is little concrete information about this continent or what it contains.

In George R.R. Martin's book, The World of Ice & Fire, it is revealed that some legendary figures, such as Elissa Farman, have attempted to sail west and explore what lies beyond. However, none of these explorers have returned, leaving their fate a mystery.