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Virtual water imports and exports in the Roman world

Virtual water imports and exports in the Roman world (Credit: Dermody et al., Hydrology and Earth System Sciences, 2014)

These maps show simulations of the virtual water imported (top) and exported (bottom) in the Roman Empire. The relative amount of virtual water exchanged is illustrated by the size of the circles, while the numbers show the amount imported or exported in tonnes of grain per year. Rome is the largest importer of virtual water.

Please refer to the Hydrology and Earth System Sciences paper for further details about the image, including a full interpretation of the simulation results.

Credit: Dermody et al., Hydrology and Earth System Sciences, 2014

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