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The T is the Mediterranean, the Nile, and the Don (formerly called the Tanais) dividing the three continents, Asia, Europe and Africa, and the O is the encircling ocean. Jerusalem was generally represented in the center of the map as the navel of the world, the umbilicus mundi. Asia was typically the size of the other two continents combined.
A continent is any of several large geographical regions. Continents are generally identified by convention rather than any strict criteria. A continent could be a single landmass or a part of a very large landmass, as in the case of Asia or Europe. Due to this, the number of continents varies; up to seven or as few as four geographical regions ...
Map of the "Old World" (the 2nd-century Ptolemy world map in a 15th-century copy) This T and O map, from the first printed version of Isidore's Etymologiae (Augsburg, 1472), identifies the three known continents (Asia, Europe and Africa) as respectively populated by descendants of Sem (), Iafeth and Cham ().
Antarctica Map of island countries: these states are not located on any continent-sized landmass, but they are usually grouped geographically with a neighbouring continent. Determining the boundaries between the continents is generally a matter of geographical convention. Several slightly different conventions are in use.
The landmass was illustrated as a circle (an "O") divided into three portions by a "T". These three divisions were the continents of Asia, Africa and Europe. The popularity of the Macrobian maps and the combination of T-O style continents on some of the larger Macrobian spheres illustrate that Earth's sphericity continued to be understood among ...
A Ptolemaic world map from the Geography (Johannes Schnitzer, 1482) Ancient Greek and Roman geographers knew the approximate size of the globe, but remained ignorant of many parts of it. Eratosthenes of Cyrene (276–196 BC) deduced the circumference of the Earth with remarkable accuracy, within 10% of the correct value.
Stating that "continents are bounded more properly, when it is possible, by seas than by rivers," Ptolemy defines a three-continent system: Europe, Libya, Asia. His Libya is the North Africa of today, containing a province, Africa, whose name replaced Libya.
List of political and geographic subdivisions by total area, comparing continents, countries, and first-level administrative country subdivisions. List of first-level administrative divisions by population; List of FIPS region codes in FIPS 10-4, withdrawn from the Federal Information Processing Standard (FIPS) in 2008