Poison Sea
From A Wiki of Ice and Fire
The Poison Sea is a large inland sea at the northeastern edges of the Red Waste.[1][2] The ruined city of Adakhakileki lies at the northern tip of the sea. Northeast of the sea is Vaes Jini and the Stone Road. The entire eastern side of the Poison Sea abuts mountains which form part of the Bone Mountains. Many leagues south of the Poison Sea lies Qarth.
Behind the scenes
The Poison Sea has not yet been mentioned in the A Song of Ice and Fire novels and only appears in the map collection of The Lands of Ice and Fire.