From A Wiki of Ice and Fire
The Shivering Sea is a frigid sea north of Essos. It is bounded to the west by Westeros, to the south by Essos, to the north by a vast frozen wilderness called the White Waste, and to the east by lands and seas unknown.
The waters of the Shivering Sea teem with life. Hundreds of varieties of fish swim through its depths, including salmon, wolf fish, sand lances, grey skates, lampreys and other eels, whitefish, char, shark, herring, mackerel, and cod. Crabs and lobsters are found everywhere along its shores. Seals, narwhals, walruses, and sea lions have their rookeries and breeding grounds on and around the countless rocky islands and sea stacks. The sea is also home to many whales, including grey whales, white whales, humpbacks, spotted whales, and leviathans. The westernmost reaches of the Shivering Sea, from Skagos and the Grey Cliffs to the delta of the Sarne, are the richest fishing grounds in the known world.
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