Kwarin kogin Red River ya kafa wani yanki na yanayi da tattalin arziki, wanda ya yi iyaka da arewa da yamma da tsaunuka da dazuzzuka, daga gabas ta teku da kudu da Kogin Red River.^[12] Bukatar samun iko guda ɗaya don hana ambaliya na kogin Red River, don haɗa kai wajen gina tsarin ruwa, musayar kasuwanci, da kuma tunkuɗe mahara, ya haifar da ƙirƙirar jihohin Vietnamese na farko na almara kusan 2879 KZ.Duk da yake a cikin lokutan baya, ci gaba da bincike daga masana ilmin kayan tarihi ya nuna cewa al'adun Đông Sơn na Vietnamese sun kasance a cikin Arewacin Vietnam, Guangxi da Laos a kusa da 700 KZ.^[13]Masana tarihi na Vietnamese sun danganta al'adar ga jihohin Văn Lang da Âu Lạc.Tasirinsa ya bazu zuwa wasu sassa na kudu maso gabashin Asiya, gami da Maritime kudu maso gabashin Asiya, daga kusan 1000 KZ zuwa 1 KZ.Mutanen Dong Son sun kware wajen noman shinkafa, adana bawon ruwa da aladu, kamun kifi da kuma tuki a cikin dogayen kwalekwale.Hakanan sun kasance ƙwararrun ƙwararrun ƙwararrun tagulla, wanda aka tabbatar da ganga Dong Son da aka samu a ko'ina cikin arewacin Vietnam da Kudancin China.^[14] A kudancin al'adun Dong Son shine al'adun Sa Huỳnh na proto-Chams.