Boundaries between the continents of Earth Boundaries between the continents of Earth The boundaries between the continents of Earth are generally a matter of geographical convention. Several slightly different conventions are in use. The number of continents is most commonly considered seven but may range as low as four when the Americas and Afro-Eurasia are each considered a single continent. According to the definition of a continent in the strict sense, an island cannot be part of any continent, but by convention and in practice most major islands are associated with a continent. There are three overland boundaries subject to definition: While the isthmus between Asia
Karain semi-continent semi-continent has four distinct watersheds, the largest of which makes up the entire core of the semi-continent itself. The center of the semi-continent is a massive valley running roughly south to north, and bordered on three sides by mountain chains. Runoff from the mountains flows downhill until it meets Lake M-pulo. To the south, the Karain watershed is bordered by the alpine Islandia Mountains, and meltwater from these provides most of the water to the valley. In the west, the Ono and Matclorn Rivers flow south and east out of the mountains over the Sobo steppes, which eventually merge into