Today, there are more borders in the world than ever before in human history. In this book James Crawford argues that our enduring obsession with borders has brought us to a crisis point: that we are entering the endgame of a process that began thousands of years ago, when we first started dividing up the earth. Beginning with the earliest known marker which denoted the end of one land and the beginning of the next, Crawford follows the story of borders into our fragile and uncertain future - towards the virtual frontiers of the internet, and the shifting geography of a world beset by climate change.