This article provides the first overview of the dialogues between Brazilian and Portuguese geography throughout the 20th and 21st centuries. We expand current debates about marginal geographies in the growing field of global histories of geography by arguing that the Luso-Brazilian case reveals how international epistemic communities can be formed between semiperipheral geographic communities. We call attention to the role that science funding plays in the making of epistemic communities in semiperipheral spaces where political instability prevails, by allowing the creation of platforms of dialogue between geographic academies, such as international conferences, scientific journals, and research projects.