Why is Putin obsessed with Crimea? What role did waterfalls play in the development of the African continent? Why is China building a naval fleet? What conflict is brewing between Egypt and Ethiopia? Whether powerful mountain ranges or desirable seaports, a country's geographical features influence the actions of its leaders. To follow world politics you need to understand people, ideas and movements, but without a knowledge of geography you will never get a complete picture. Using ten maps, experienced foreign correspondent Tim Marshall explains how borders, resource supplies and the course of rivers continue to shape the course of world history.