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| | Asia - MSN Encarta |
 | | On the west, the conventional boundary between Europe and Asia is drawn at the Ural Mountains, continuing south along the Ural River to the Caspian Sea, then west along the Caucasus Mountains to the Black Sea. |
 | | Asia's physiographic system focuses on the Pamir Knot, a towering plateau region known as the Roof of the World, located where the borders of India, China, Tajikistan, Pakistan, and Afghanistan converge; several peaks here exceed 6,100 m (20,000 ft). |
 | | In eastern and southern Asia, the most valuable soils for agriculture are the alluvial soils deposited in the lower valleys of the great rivers, especially the Indus and Ganges. |
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