A continuous land mass which has a distinct identity, and which is larger than a certain arbitrary size:

  • Antarctica
  • The list of "continents" is shaped by two forces, which sometimes act in concert, and sometimes in opposition:

    • Physical geography resulting from geological processes. To a geologist, a "continent" is a mass of sial or continental crust, plus the sediments that have washed off of it. This includes any continental shelf in addition to the part above water.

      The physical limits of most continents are fairly obvious; at least the bits above water. If we use geological criteria exclusively, Europe and Asia merge into one continent, Eurasia.  The two subcontinents of India and Arabia each have a tectonic identity far stronger than Europe's. Finally, Indonesia emerges as an eighth continent, mostly drowned since the end of the last ice age. The traditonal discrimination between Australia as a continent and Greenland as an island is strengthened by the fact that Australia is on its own tectonic plate, and Greenland is not.


    • Cultural geography forces, especially the historical identities of continents and political motivaitons for retaining those identities.  The distinction between Europe and Asia was made long before any geologists entered the picture, when Europe meant Greece (well, Crete really) and Asia meant Anatolia. Africa was a province of the Roman Empire, today's TunisiaArabia Felix had its own  identity distinct from Asia.

      As the size of the traditional continents expanded with knowledge of the world, so did the size requirement for a "continent".  The fabulous Southern Continent was a device used by mapmakers to fill in an empty space on the world map; the continent actually discovered, Antarctica, was far different from the tropical paradise expected (except for that bit to the north, Australia).