International audienceBehind the title of this book, we do not only address the question of the size of Beyrouth and its suburbs. In order to report on debates and opinions, implicit or explicit, in relation with the development with Beyrouth’s urbanisation since the beginning of the 19th Century the notions of limits and expansion, and those of territory and hinterland have often been put forward. Through thirteen articles gathered in this volume, authors aim a better understanding of Beyrouth and how this city, which in the 1850’s was just a small port for coastal navigation with a few thousand inhabitants, is now home to more than a million people and spreads on tens of square kilometres. But this volume does not only deal wit...