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The Geo Web and crowdsourcing have unleashed new possibilities for the production of geographic information, enabling millions of amateur contributors to engage in the creation of free and open maps. As these datasets are open to editing in loosely regulated spaces, cartographic vandalism has emerged as a constant threat to the integrity and the quality of the data. This intentional defacement of collaborative cartographic artefacts is analyzed through a qualitative analysis of reported incidents in WikiMapia and OpenStreetMap, identifying its similarities and differences to other forms of online and offline vandalism. Contributors employ counter-strategies to online cartographic vandalism, harnessing social and technical resources to foster cooperation and reduce deviance.