Continent Europe and Asia together as a single continent, dubbed "Eurasia". In this model, the world is divided into six continents, with North America and South America considered separate continents. Geologists use the term "continent" in a different manner from geographers. In geology a continent is defined by continental crust: a platform of metamorphic and igneous rock, largely of granitic composition. Some geologists restrict the term 'continent' to portions of the crust built around stable Precambrian "shield", typically 1.5 to 3.8 billion years old, called a craton. The craton itself is an accretionary complex of ancient mobile belts (mountain belts) from
Karain semi-continent non-Islandian portion of the semi-continent, about 40% of the whole, is independent. This region comprises primarily interior lands, chiefly the Col Plateau, which is mostly desert. The largest populated area of the independent portion of Karain is the Demiji, located between the Col Plateau and Mobono. Later political developments in Karain have not been portrayed in the published fiction on Islandia. Presumably after World War I the German controlled regions would have been assigned to other nations as trustee territories. The last glimpse of Karain is from 1969, at which time Islandia is contemplating joining the United Nations; no information