Proposed by the British geographer Sir Halfard Machinder. In this theory, he put the Eurasian Africa and the three continents together a vast island in the world's oceans, known as the "World Island", the middle of Eurasia, as the island is the heart of the world.
From the plains of Eastern Europe has been extended to the Siberia plain, including most of Russia (including Central Asia) Iran, Afghanistan and northwest Chinese. Around the "heart" is in crescent or edge crescent, other countries and regions including Turkey and Austria in Germany Chinese hardness of the Eurasian Continental margin.
Mdkin believes that the central region of the country will continue to hold strong, and have the ability to expand the edge of eurasia.