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Map of the coast of Tsiompa and Couchinchina (Vietnam) designed for navigation, with a rhumbline network and bathymetry (sea depth). The large area marked with crosses represents the Paracel Islands. The modern city of Da Nang is at the far right.

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).

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).