 The eighteenth-century French geographer, Jean-Baptiste Bourguignon d'Anville, located Cattigara at the mouth of the Mekong ("Cottiaris") River, where it is shown on his map, "Orbis Veteribus Notus" (The World Known to the Ancients).The Swedish yachtsman and writer Bjorn Landström also concluded, from the sailing directions given by the ancient merchant and seafarer Alexander, that Cattigara lay at the mouth of the Mekong.The "father of Early Southeast Asian History", George Coedès, has said