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China and India: two massive countries with huge populations that share a very long border but are not politically or culturally aligned. It wouldn't be surprising if these two giants had fought each other in several wars, but in fact, apart from one month-long battle in 1962, they never have. Why? Because between them is the highest mountain range in the world, and it is practically impossible to advance large military columns through or over the Himalayas. As technology becomes more sophisticated, of course, ways are emerging of overcoming this obstacle, but the physical barrier remains a deterrent, and so both countries focus their foreign policy on other regions while keeping a wary eye on each other.

Geography has always been a prison of sorts - one that defines what a nation is or can be, and one from which our world leaders have often struggled to break free.

The land on which we live has always shaped us. It has shaped the wars, the power, politics and social development of the peoples that now inhabit nearly every part of the earth. Technology may seem to overcome the distances between us in both mental and physical space, but it is easy to forget that the land where we live, work and raise our children is hugely important, and that the choices of those who lead the seven billion inhabitants of this planet will to some degree always be shaped by the rivers, mountains, deserts, lakes and seas that constrain us all - as they always have.