The social sciences and humanities in general and International Relations (IR) specifically are organised around what has been called ‘analytic bifurcation’. Analytic bifurcations artificially structure and divide analytic spaces into, for example, Europe/non-Europe, inside/outside, state/empire, and metropole/colony. Recently, these bifurcations have been problematised within IR and adjacent fields. Our article contributes to and extends these discussions by foregrounding two interrelated aspects that have not received sufficient attention: first, connections between colonies rather than between metropole and colony and, second, the construction and reproduction of the bifurcation of Europe/non-Europe. We explore how technologies of power, in our case mapping and the use of ‘blank spaces’, were used to create imaginaries of colonisable land. To do so, we trace two episodes from nineteenth-century German colonial discourse. The first episode analyses imaginaries of exploration in the Humboldtian tradition and how these imaginaries depict spaces outside of Europe, namely in Africa, as blank spaces. The second episode reconstructs the cartographic work of Paul Langhans, who focused on mapping ‘Germandom’ (Deutschtum) in Central and Eastern Europe. Juxtaposing these two episodes shows the interconnectedness between these spaces (Africa and the European East) and how techniques such as blank spaces were applied to create colonisable land.