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Two maps, one of which features mainland Southeast Asia: Anam (Tonquin and Cochin China) in red, Lower Cochin China in green, Cambodia in yellow, and Siam in white. An inset map shows maritime routes between Europe and Asia.

The arrows on this map mark the direction of the seasonal monsoons experienced in the South China Sea and Philippine Sea during the late 18th century. Each arrow has a label indicating the month.