The difference between sea and ocean lies both in size and proximity to land. An ocean is a vast body of water whereas a sea is a comparatively small and partially confined body of water surrounded by land. For example, the Atlantic Ocean compared to the adjacent Mediterranean Sea.
When it comes to bodies of water, there are two that are often mixed up: oceans and seas. However, the one difference between the two is simple. What sets oceans and seas apart is that seas are partially enclosed by land.
Although colloquially most people use the words “sea” and “ocean” interchangeably, it is important we know what both terms mean accurately. Having said that, it is true that most people refer to seas like the Mediterranean or the Caribbean correctly as “seas”. The most common problem is when they refer to oceans wrongly as seas, for example, when talking about the Atlantic.
Manchester, England, England
Across the Atlantic Sea
And I’m a genius, genius
I believe in God
And I believe that God
Believes in Claude
That’s me, that’s me
The song refers to the Atlantic as “the Atlantic Sea” instead of the “Atlantic Ocean”.
What Are Oceans?
Following the difference between seas and oceans, we could say that there is only one ocean, the World Ocean. After all, there is one contiguous body of water that covers 71 percent of our planet.
But historically this body of water has been divided into different regions, known as oceans. The boundaries of these oceans have changed over time and the current four or five oceans are the results of hundreds of years of historical, cultural, scientific, and geographical evolution.
The main four oceans are:
- The Atlantic Ocean
- The Pacific Ocean
- The Indian Ocean
- The Arctic Ocean
Most countries know also recognized the Southern or Antarctic Ocean. So, for most countries in the world, there are currently five oceans on planet earth.
Each of these five oceans includes several seas, which is where things get complicated.
Let’s now look at the seas in each ocean.
Seas in the Atlantic Ocean
In the Americas portion of the Atlantic Ocean, there are several seas:
|Atlantic Seas In Americas|
|Caribbean Sea (Gulf of Gonâve, Gulf of Honduras, Golfo de los Mosquitos, Gulf of Venezuela, Gulf of Paria, Gulf of Derién)|
|Gulf of Maine (Bay of Fundy, Massachusetts Bay, Cape Cod Bay)|
|Gulf of Mexico (Bay of Campeche, Campeche Bank)|
|Gulf of St Lawrence|
|Long Island Sound|
|New York Bay|
These are the seas in Europe, Asia, and Africa portions of the Atlantic Ocean:
|Atlantic Seas In Europe/Asia/Africa|
|Baltic Sea (Archipelago Sea, Bothnian Sea, Central Baltic Sea, Gulf of Riga, Oresund Strait, Sea of Åland)|
|Bay of Biscay (Cantabrian Sea)|
|Mediterranean Sea (Adriatic Sea, Aegean Sea (Myrtoan Sea, Sea of Crete, Thracian Sea), Alboran Sea, Balearic Sea, Catalan Sea, Cilician Sea, Gulf of Sidra, Ionian Sea, Levantine Sea, Libyan Sea, Ligurian Sea, Sea of Sardinia, Sea of Sicily (Inland Sea, Gozo), Tyrrhenian Sea)|
|North Sea (Wadden Sea)|
|Gulf of Guinea|
|Sea of Azov|
The Northern Islands are also home to several seas:
- Irminger Sea
- Denmark Strait
- Irish Sea
- Inner Seas of the West Coast of Scotland (Sea of the Hebrides)
Apart from all these oceans, there is also a sea in the Atlantic Ocean that is not defined by its geographical location but by currents. It is the Sargasso Sea (also known as the North Atlantic Gyre).
Seas in the Arctic Ocean
|Seas In the Arctic|
|Barents Sea (Pechora Sea, White Sea)|
|Hudson Bay (James Bay)|
|Queen Victoria Sea|
|East Siberian Sea|
|Northwest Passages (Prince Gustav Adolf Sea, Amundsen Gulf)|
Seas in the Southern Ocean (Antarctic)
|Seas In the Southern Ocean|
|Gulf St Vincent|
|Great Australian Bight|
|King Haakon VII Sea|
Seas in the Indian Ocean
|Seas In the Indian Ocean|
|Andaman Sea (Gulf of Moattama)|
|Bay of Bengal|
|Gulf of Aden|
|Gulf of Oman|
Seas in the Pacific Ocean
The seas in the Americas portion of the Pacific Ocean are as follows:
- Bering Sea
- Chilean Sea
- Sea of Chiloé
- Gulf of Alaska
- Gulf of California (also known as the Sea of Cortés)
- Mar de Grau
- Salish Sea
The seas in the Asia and Oceania portion of the Pacific Ocean are the following:
|Seas In The Pacific Ocean (Asia/Oceania)|
|Bohol Sea (also known as Mindanao Sea)|
|East China Sea|
|Gulf of Carpentaria|
|Gulf of Thailand|
|sea of Japan|
|sea of Okhotsk|
|Seto Inland Sea|
|South China Sea|
To complete the list of seas we would have to also include all the salt lakes that have the word “sea” as part of their names:
- Aral Sea
- Caspian Sea
- Dead Sea
- Salton Sea
And also freshwater lakes that have the word “sea” as part of their names, such as the Sea of Galilee.
Finally, there are all the small fjords, straits, and bays, that would just be too many to name.