This chapter investigates the affective, spatial, and historical dimensions of medieval migrations across the Amu Darya—known historically as the Oxus River. Sobti conceptualises the riverine zone as a “thick” liminal borderland shaped by centuries of mobility, conflict, and cultural exchange. Drawing on anthropological theories of memory and landscape, the chapter argues that migrant journeys across these spaces produced hybrid cultural imaginaries and deep collective memories fundamental to the socio-cultural evolution of Eurasia. The narrative reconstructs how Arab military incursions, nomadic movements, and interactions between sedentary and pastoral communities generated layered identities embedded in riverine ecologies. Rather than analysing migration purely through demographic or economic metrics, Sobti foregrounds affect, imagination, and embodied experience as central to understanding historical mobility across Central Asia’s most enduring natural frontier.