The Sea of Claws is a minor part of the Warhammer

Warhammer Fantasy (setting)

Warhammer Fantasy is a fantasy setting, created by Games Workshop, which is used by many of the company's games. Some of the best-known games set in this world are: the table top wargame Warhammer Fantasy Battle, the Warhammer Fantasy Roleplay pen-and-paper role-playing game, and the MMORPG...

 fictional world. It is roughly equivalent to the real world Baltic Sea

Baltic Sea

The Baltic Sea is a brackish mediterranean sea located in Northern Europe, from 53°N to 66°N latitude and from 20°E to 26°E longitude. It is bounded by the Scandinavian Peninsula, the mainland of Europe, and the Danish islands. It drains into the Kattegat by way of the Øresund, the Great Belt and...

. The Sea is mentioned in the many of the settings sourcebooks and maps. Its name comes from its abundance of sea creatures.

On the shores of Sea of Claws are Empire, Kislev

Kislev (Warhammer)

In the Warhammer Fantasy setting, Kislev is the name of a Slavic/Kievan Rus'-themed fictional country that sits northeast of The Empire, between it and the Realm of Chaos. Between Kislev and Norsca lies Troll Country, while beyond that lie the magic-tainted Chaos Wastes...

, Bretonnia

Bretonnia

In Games Workshop's Warhammer Fantasy fictional universe, Bretonnia is a country located west of the Empire, between the Grey Mountains and the Great Ocean in the lands that were once part of the domain of the Elves...

, Norsca

Norsca

Norsca is a fictional place in Games Workshop's Warhammer Fantasy world setting. It is analogous in position within the "Old World" to Scandinavia and its human occupants, the "Norse", are a fantasy version of the Norse peoples ....

 and also the great city of Marienburg

Marienburg (Warhammer)

Marienburg is a fictional city in the Warhammer Fantasy universe. It is a wealthy city that has broken apart from the rest of the Empire, and is roughly analogous to the 16th and 17th century Low Countries, although as with many of the Warhammer Background's Cities it also is heavy influenced by UK...

. On the shores of sea is located Norsca city of Olricstaad.

Dangers On The Sea

Its name comes from its abundance of sea creatures. The numbers, deadliness, and mutations of these creatures increase the further north you go towards the Chaos Wastes. Sea-borne creatures are not the only dangerous hazards on the sea, Norse reavers sail there and practice piracy. There are other pirates also and then there are natural hazards, like many storms.

Whales and sharks live in the sea.