This major reference collection highlights the contested and diverse nature of geopolitics and charts the controversial intellectual history of the field. Coined by the Swedish author, Rudolf Kjellén, the term 'geopolitics' highlights the role that territory, resources and boundaries play in shaping global political relations. The collection brings together work from international relations, political science, history, geography and law into a definitive collection that covers three dimensions of the geopolitical: classic geopolitics, critical geopolitics, and popular geopolitics.