at sea
A sea is a large expanse of saline water connected with an ocean, or a large, usually saline, lake that lacks a natural outlet such as the Caspian Sea and the Dead Sea. The Sea of Galilee is a small freshwater lake with a natural outlet, but the term was applied to it anyway. The term is used colloquially as synonymous with ocean, as in the tropical sea or down to the sea shore, or even sea water referring to water of the ocean.
Many seas are marginal seas.
List of seas, divided by ocean
Bering Sea Gulf of Alaska Sea of Cortez (aka Gulf of California) Sea of Okhotsk Sea of Japan Seto Inland Sea East China Sea South China Sea Sulu Sea Celebes Sea Bohol Sea (aka Mindanao Sea) Philippine Sea Flores Sea Banda Sea Arafura Sea Timor Sea Tasman Sea Yellow Sea Coral Sea Gulf of Carpentaria
Hudson Bay* James Bay Baffin Bay Gulf of St. Lawrence Caribbean Sea Gulf of Mexico Sargasso Sea North Sea Baltic Sea* Gulf of Bothnia Irish Sea Celtic Sea Mediterranean Sea* Adriatic Sea* Aegean Sea* Black Sea** Sea of Azov* Ionian Sea* Ligurian Sea* Mirtoon Sea* Tyrrhenian Sea* Gulf of Sidra* Sea of Marmara* Sea of Crete Bay of Biscay Gulf of Guinea
Lunar maria are vast basaltic plains on the Moon that were thought to be bodies of water by early astronomers, who referred to them as "seas". Liquid water is thought to be present under the surface of several moonss, most notably Europa. Liquid hydrocarbons are thought to be present on the surface of Titan, though it may be more accurate to describe them as "lakes" rather than "seas". The distribution of these liquid regions will hopefully be better known after the arrival of the Cassini probe.
Science The term "sea" has also been used in quantum physics. Dirac sea is an interpretation of the negative energy states that comprises the vacuum.
See also
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