Shivering Sea

The Shivering Sea is a large sea or ocean that lies north-east of Westeros and north of Essos. It separates Essos from the northern polar icecap. The Narrow Sea opens into the Shivering Sea just east of the Vale of Arryn.

In the books
In the Song of Ice and Fire novels, the Shivering Sea is said to be home to many whales. The largest island on the sea, Ibben, lies hundreds of miles due east of Skagos and is home to folk who make their trade from fishing and whaling, selling their catches in the Free Cities and the ports of north-eastern Westeros.