In a 1989 essay in Cartographica the historian of cartography J. B. Harley argued that maps are not neutral mirrors of terrain but rhetorical documents that help construct the territory they claim to describe. Reading them with Foucault and Derrida, he showed how projection, ornament, standardisation and above all silence encode the interests of the states, empires and surveyors who commissioned them: what is left off a map matters as much as what is drawn. Cartographic accuracy is itself a claim to authority, one that displaces other ways of knowing land. The argument, developed alongside his History of Cartography project, opened the field of critical cartography.
It reframed the map, the survey and the plan as instruments of power rather than description, which is why land claims, informal settlements and indigenous territories are so often won or lost on paper before they are contested on the ground. Counter-mapping, participatory GIS and community land documentation all follow from taking the point seriously.
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