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
A Map of Middle-earth of antagonists from the novel, including the nine Black Riders, Gollum, Shelob, and various Orcs. A Map of Middle-earth A Map of Middle-earth is the name of two colour posters by different artists, published in the late 1960s and early 1970s by the American and British publishers of J. R. R. Tolkien's book "The Lord of the Rings". Both posters were based on cartography by J. R. R. Tolkien and Christopher Tolkien to depict the fictional region of Middle-earth. None of these maps cover the whole continent of Middle-earth; instead they only portray the north-western part of the continent, where