The chapter tries to reconceptualize (i.e., reimagine) geopolitical configurations of Asia as framed by the current Area Studies paradigm though the prism of the socio- spatial construction of “Maritime Asia”. Acri advocates a borderless history (and geography) of the largely maritime and littoral swathe of territory from the Indian Ocean littorals to the Western Pacific in the longue durée that takes into account long-distance connections and dynamics of religious interaction. Having surveyed the genealogy of the expression “Maritime Asia”, Acri describes this dynamic macro-region of intersecting discursive fields across which networks of cultural brokers travelled since time immemorial, regarding it as forming—just like Eurasia—one interconnected network with a shared background of human, intellectual, and environmental history. The chapter then applies the concept of Maritime Asia to the study of the genesis and circulation of Sanskritic Buddhism(s) across the region from the third to the fourteenth century and beyond, and offers some concluding reflections situating the concept in the intellectual trajectory of such terms as “Eurasia”, “Monsoon Asia”, and the “Indian Ocean World”.