Continents, seas and oceans

Continents, seas and oceans

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By analyzing the earth's surface through features such as maps and photos, we will find that the portion of the earth's surface (continents and island) is less than the amount of water in the oceans and seas (net mass).

This can be clearly seen in the following image of the world map.


The seas can be seen in several ways:

Inland Seas

Although they are connected to the ocean through straits and canals, they are almost entirely enclosed by land. As an example we cite the Baltic, Red, Black and Mediterranean.

Satellite image of the mediterranean sea.

Open seas

They are directly linked to oceanic waters, such as the Antilles Sea and the China Sea.

Closed Seas

They stand in isolation from oceans such as the Caspian, Aral, and Dead.

Main features of the continents

American continent

Its shape is elongated in a north-south direction, being divided by the equator line. To the north is the Tropic of Cancer; to the south, the Tropic of Capricorn. In the northern portion is the Arctic Circle. To the east and west of the continent are the Atlantic and Pacific oceans, respectively. To the north, the continent is surrounded by the icy waters of the Arctic Glacier. The American continent is formed by two large blocks that are joined by an isthmus, which matches the size of the Central American continent.

African continent

It is separated from Eurasia by the Suez Canal path, which connects the Red and Mediterranean Seas. Extensive, its 30 million kilometers are bordered by the Atlantic (west) and Indian oceans (east), as well as the Red and Mediterranean seas. Of all the continents it is the fullest, being divided to the south by the Tropic of Capricorn, to the north by the Tropic of Cancer, and in the center by the Equator Line.

Eurasian Continent

It differs from other continents because it has the largest continental bloc. It is bathed by the Pacific (east), Atlantic (west), Arctic (north) and Indian (south) oceans. The Eurasian continent is surrounded by several seas: Mediterranean, Red, Arabian, Caspian, Black, Bering and Northern. It is divided by the Arctic Circle, the Tropic of Cancer and Ecuador (only in the island: Malaysia and Indonesia).

Australian continent

It is located in the latitude of the Tropic of Capricorn (southern hemisphere), having its coasts bathed by the Pacific (west) and Indian oceans (east). It stands out from other continents for being the smallest.


The continent is bathed by the waters of the Pacific, Atlantic and Indian oceans. It is almost entirely covered by a full layer of ice. It is surrounded by the Antarctic Polar Circle.

Occupation of the continents

Because the continents are distinct from each other in the form of occupation, it was agreed, from the period of occupation made by man, the proper designation for each of them.
Old Continent or Old World: Region from which the settlers left (Eurasia and Africa).

New Continent or New world: Region colonized by the Europeans and discovered by Christopher Columbus in the 15th century (America).
Brand New Continent: Called Oceania and also known as Australian continent (Australia, New Zealand and Pacific Islands). Region taken by the Europeans in the early eighteenth century.

We also use in the geographical system the denomination Eastern World and Western World, referring to the initial length of Greenwich.