Sothoryos

Sothoryos or Sothoros is a continent that lies to the south-east of Westeros and due south of Essos, across the Summer Sea. It is mostly unexplored. The Summer Islands are known to lie off its western coast.

In the books
In the Song of Ice and Fire novels, the north coast of Sothoryos lies a few hundred miles south of Slaver's Bay and Valyria. This coastline and its cities was devastated in the Doom of Valyria, which triggered tsunamis and tidal waves that inundated the coastlands.

Sothoryos appears to consist of deserts and jungles, and is home to certain species of hairy ape. Little else about it is known.