Jade Sea

The Jade Sea is a body of water that lies several thousand miles east of Westeros. Its is known as an exotic location and the source of valuable trade goods. However, the voyage from Westeros to the Jade Sea and back again is a risky undertaking lasting months or even years on end, and only the hardiest traders dare to make the voyage.

Major ports on the Jade Sea include Qarth and Asshai.

In the books
In the Song of Ice and Fire novels, the Jade Sea lies approximately three thousand miles to the east Westeros. It is connected to the Summer Sea by the Straits of Qarth, also called the Jade Gates. Qarth lies at the western-most end of the sea, Asshai at the south-eastern-most end.

It is unclear is the Jade Sea is a massive, landlocked bay connected to the Summer Sea (similar to the relationship between the Black Sea and the Mediterranean), or a totally seperate ocean which separates Essos from the southern continent of Sothoryos.