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The unknown southern continent is perhaps one of the most puzzling aspects of Gerardus Mercator's otherwise strikingly modern cartography. This paper is an attempt to reconsider it in view of Renaissance cosmology and to outline two factors that led Mercator to engage with the mythical terra australis over decades: his socio-professional status as an artisan and the desire to be a philosopher, on the one hand, and the harsh business of mapmaking in the Low Countries on the other. The resulting unknown southern continent was intimately connected to the classical tradition and geocentric cosmology but also to the specific social niche Mercator was trying to establish for himself. [ABSTRACT FROM AUTHOR]