As the point of contact between states, land boundaries are often the focus of political strains and stresses, whether or not they are the direct cause. Boundaries also create landscapes, and fundamentally affect communications, settlement patterns, and access to resources.

Blake, G. H. (1994). 'Preface'. In Schofield, C. H. (ed.) Global Boundaries: World Boundaries vol. 1. London: Routledge, pp xii-xvii. p. xii.