From A Wiki of Ice and Fire
Sothoryos or Sothoros is one of the four known continents in the world. It lies to the southeast of Westeros and is south of Ghiscar in Essos across the Summer Sea. East of Sothoryos is the southern Jade Sea.
Sothoryos is a large continent, covered in jungles, plague-ridden, and largely unexplored. The northern coast has been mapped, with the ruined cities of Zamettar, Yeen, Gogossos and Gorosh noted, but little else is known of them. Wyvern Point is in northeastern Sothoryos near Lesser Moraq.
The north coast has many islands along its length, such as the Isle of Tears and Isle of Toads, as well as the Basilisk Isles, presumably named for the creatures inhabiting them. Ax Isle and Naath also lie off the coast of the continent. 
See also: Beastiary.
References and Notes