The Open Polar Sea, a hypothesized ice-free ocean surrounding the North Pole
Black Sea | Mediterranean Sea | Baltic Sea | North Sea | Red Sea | Caspian Sea | Caribbean Sea | Adriatic Sea | Aegean Sea | South China Sea | Sea of Japan | Irish Sea | Westland Sea King | Dead Sea | Arabian Sea | Tyrrhenian Sea | Southend-on-Sea | East China Sea | Ionian Sea | Order of the Polar Star | Bering Sea | White Sea | Kara Sea | First Sea Lord | Manly-Warringah Sea Eagles | Dead Sea Scrolls | British Sea Power | Tasman Sea | Sea Islands | Great Big Sea |
McGoogan, Ken, Race to the Polar Sea: The Heroic Adventures and Romantic Obsessions of Elisha Kent Kane (Toronto, HarperCollins Publishers Ltd, 2008. ISBN 978-0-00-200776-4)
The Zhubov scale is a way of reporting polar sea ice coverage, it was developed in the former USSR by Russian naval officer N. N. Zhubov (1895 - 1960).