The Dong Son culture (named for ?ông S?n, a village in Vietnam) was a Bronze Age culture in ancient Vietnam centred at the Red River Valley of northern Vietnam from 1000 BC until the first century AD.:207 It was the last great culture of V?n Lang and continued well into the period of the Âu L?c state. Its influence spread to other parts of Southeast Asia, including Maritime Southeast Asia, from about 1000 BC to 1 BC.
The Dong Son people, who are also known as L?c or L?c Vi?t, were skilled at cultivating rice, keeping water buffalos and pigs, fishing and sailing in long dugout canoes. They also were skilled bronze casters, which is evidenced by the Dong Son drum found widely throughout northern Vietnam and South China.
On the other hand, Ferlus (2009) showed that the inventions of pestle, oar, and a pan to cook sticky rice, which is the main characteristic of the ?ông S?n culture, correspond to the creation of new lexicons for these inventions in Northern Vietic (Vi?t-Mng) and Central Vietic (Cuoi-Toum). The new vocabularies of these inventions were proven to be derivatives from original verbs rather than borrowed lexical items. The current distribution of Northern Vietic also correspond to the area of Dong Son culture.
Furthermore, John Phan (2013, 2016) argues that "Annamese Middle Chinese" and northern Vietic was spoken in the Red River Valley and Annamese was later absorbed into the coexisting Proto-Viet-Muong, one of whose divergent dialect evolved into Vietnamese language.
The origins of Dong Son culture may be traced back to ancient bronze castings. However, according to archaeological discoveries in Isan, Thailand in the 1970s, the casting of bronze began in Southeast Asia first. The Dong Son bronze industry has a local origin, equivalent in timing to the Gò Mun culture, 700-500 BC. This includes bronze axes, spearheads and knives.
The bronze drums were used for war, "the chief summons the warriors of the tribe by beating the drum", when mourning, and during feasts. "The scenes cast onto the drums would inform us that the Dong Son leaders had access to bronze founders of remarkable skill." Lost-wax casting was based on Chinese founders, but the scenes are local, including drummers and other musicians, warriors, rice processing, birds, deer, war vessels, and geometric designs.:200-202
The bronze drums were made in significant proportions in northern Vietnam and parts of Yunnan. The Dong Son bronze drums exhibit "remarkable skill". The C? Loa drum weighs 72 kilograms (159 lb) and would have required the smelting of between 1 and 7 tonnes (1.1 and 7.7 tons) of copper ore.:200