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The purpose and market for this book are not stated. Its subject matter, though, is clear enough. It is about the, mainly, transcontinental routes along which people and goods travel. These are rivers (for example the Rhine, Nile, Mekong), seaways (English Channel, Dardanelles), canals (Suez, Panama), roads (the continent‐bridging highways of Canada, Trans‐Kalahari Highway), railways (Trans‐Siberian, Benguela) and general land routes (Khyber Pass and the Silk Road). Such highways are strategically important economically and politically. Thus rivers, the major category of highway, are arteries for population movement and trade, they form political boundaries, and they are, increasingly, the battleground for...

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