From the account of the voyage of Alexander referred to by Ptolemy, Kattigara can actually be located only in the Mekong delta, because Alexander went first along the east coast of the Malacca peninsula, northward to Bangkok, from thence likewise only along the coast toward the south east, and so came to Kattigara. We hear nothing of any further change of course. 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.