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This study is concerned with raised fields – impressive pre-Columbian agricultural earthworks found throughout southwestern Amazonia – in the Llanos de Moxos (LM), in the Bolivian Lowlands. We explore the complexity of coupled human–environment interactions and propose hypotheses to explain the variation observed in the design of raised fields. We provide the most detailed description and mapping to date of raised fields and their distribution across the Bolivian Amazon. To do so, we draw on published data and on new information obtained through fieldwork, mapping, and geochemical analysis of raised fields. We describe all types of raised fields known in the LM, and introduce one new type, the filón. Our findings suggest that variation in the design of field types occurring in different regions primarily reflects differential adaptations to local environmental settings (e.g., variation in soil types, hydrology, soil …