The second excavation was carried out at the Iron Age burial site of Hoa Diem, central Vietnam in 2010. The funerary accessory pottery associated with burial jars at Hoa Diem shows the striking similarity to the pottery found at the Kalanay Cave in the central Philippines and on the Samui Island in southern Thailand. Archaeological study made us believe that those ceramic vessels should be dated back to the 2nd and 3rd century AD, as it was also verified by the C14 date of a human tooth found in a jar burial. Thus, the interaction beyond the South China Sea took place during the period of the first state formation in Southeast Asia.
