Territorial disputes have defined modern politics, but political theorists and philosophers have said little about how to resolve such disputes fairly. Is it even possible to do so? If historical attachments or divine promises are decisive, it may not be. More significant than these largely subjective claims are the ways in which people interact with land over time. Building from this insight, Avery Kolers re-evaluates existing political theories and develops an attractive alternative. He presents a novel link between political legitimacy and environmental stewardship, and applies these new ideas in an extended and balanced discussion of the Israeli-Palestinian dispute. The result is the first systematic normative theory of territory, and an impressive example of applied philosophy. In addition to political theorists and philosophers, scholars and students of sociology, international relations, and human geography will find this book rewarding, as will anyone with wider interests in territory and justice.