The Arctic,
The North Atlantic,
The South Atlantic,
The Antarctic,
The Indian,
The South Pacific
and The North Pacific

D'argh, matey, if ye want to be navigator, ye've got to learn the seas of Europe. They be seven:

1: The Caspian sea.

2: The Black sea.

3: The Aegean sea.

4: The Adriatic sea.

5: The Mediterranean sea.

6: The Tyrrhenian sea.

7: The North sea.

These seas be cold, says I, but if ye learn them, ye can rule the fleets of kings and queens. Yargh.

Shiver me timbers.