Cattigara

[8] The 18th-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).

[9] The Swedish yachtsman and writer Björn Landström also concluded, from the sailing directions given by the ancient merchant and seafarer Alexander, that Cattigara lay at the mouth of the Mekong.

[10] The "father of Early Southeast Asian history", George Coedès, has said: "By the middle of the 3rd century Fu-nan had already established relations with China and India, and it is doubtless on the west coast of the Gulf of Siam that the furthest point reached by Hellenistic navigators is to be found, that is the harbour of Kattigara mentioned by Ptolemy".

In addition, at Óc Eo, an emporium excavated in the western Mekong delta, in the ancient kingdom of Fu-nan, Roman finds from the 2nd century after Christ have come to light.

[13]Adhir Chakravarti concluded: "The archaeological remains unearthed at Oc-Eo to the south of Phnom Bà Thên in the Trans-Bassac region of Cochin-China have proved beyond doubt that it was a great port of Fou-nan and, as suggested by Mallaret and Coedès may be identified with Ptolemy's Kattigara emporium (= Skt Kirtinagara or Kottanagara)".

Johannes Schöner concluded after the circumnavigation of the world by the expedition led by Ferdinand Magellan that the Pacific Ocean was the Sinus Magnus and located Cattigara on the west coast of South America.