The surface of the earth is approximately 70.9% water and 29.1% land.  The former portion is divided into large water bodies termed oceans.  The five oceans, which are in decreasing order of size:  the Pacific Ocean, Atlantic Ocean, Indian Ocean, Southern Ocean, and Arctic Ocean.

The land portion is generally divided into several, large, discrete landmasses termed continents.  Depending on the convention used, the number of continents can vary from five to seven.  The most common classification recognizes seven, which are (from largest to smallest):   Asia, Africa, North America, South America, Antarctica, Europe, and Australia.  Asia and Europe are sometimes lumped together into a Eurasian continent resulting in six continents.  Alternatively, North and South America are sometimes grouped as simply the Americas, resulting in a continent total of six (or five, if the Eurasia designation is used).

North America is commonly understood to include the island of Greenland, the isles of the Caribbean, and to extend south all the way to the Isthmus of Panama.  The easternmost extent of Europe is generally defined as being the Ural Mountains and the Ural River; on the southeast the Caspian Sea; and on the south the Caucasus Mountains, the Black Sea, and the Mediterranean.  Africa's northeast extremity is frequently delimited at the Isthmus of Suez, but for geopolitical purposes, the Egyptian Sinai Peninsula is often included as part Africa.  Asia usually incorporates all the islands of the Philippines, Malaysia, and Indonesia.  The islands of the Pacific are often lumped with Australia into a "land mass" termed Oceania or Australasia.

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