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Four long rivers flow south through mainland Southeast Asia on this map: the ‘Menan’, ‘Manthabam’ and ‘Cosmin’ originate at a mythical lake (‘Chiamai Lac’) in southern China, while the ‘Mecon’ (Mekong) flows from the hills of Cochinchina (Vietnam).

This map of India and Southeast Asia—or ‘Indiae Orientalis [East Indies]’ as it was called at the time—was published in a book documenting the travels of the German scholar and geographer Adam Olearius (1599–1671).