▁Vietnam , ▁resulting ▁in ▁the ▁ Đ ô ng ▁S ơ n ▁culture ▁of ▁the ▁Bron ze ▁Age . ▁From ▁D ong son ▁the ▁technology ▁was ▁diff used ▁into ▁Indones ia ▁and ▁the ▁Mal ay ▁Pen ins ula ▁giving ▁rise ▁to ▁steel ▁weapons ▁such ▁as ▁broad s words , ▁spe ars , ▁and ▁kn ives . ▁The ▁icon ic ▁k ris ▁was ▁pattern ed ▁after ▁the ▁D ong son ▁d agger . ▁ ▁The ▁earliest ▁evidence ▁of ▁a ▁more ▁organ ised ▁sil at ▁comes ▁from ▁the ▁R ia u - L ing ga ▁arch ip el ago , ▁which ▁acted ▁as ▁a ▁land ▁bridge ▁between ▁the ▁Indones ian ▁Arch ip el ago ▁and ▁the ▁Mal ay ▁Pen ins ula . ▁Loc ated ▁between ▁Singapore ▁and ▁Sum atra ▁island , ▁the ▁local ▁population ▁gathered ▁great ▁mob ility ▁in ▁small ▁boats . ▁The ▁jour ne ys ▁of ▁these ▁sea - nom ads ▁regularly ▁extended ▁as ▁far ▁as ▁the ▁Mal u ku ▁Islands ▁in ▁the ▁east , ▁the ▁L esser ▁S unda ▁Islands ▁in ▁the ▁south , ▁and ▁Ten asser im ▁Island ▁in ▁My an mar . ▁At ▁some ▁point ▁or ▁another ▁they ▁came ▁into ▁contact ▁with ▁the ▁Th ais , ▁Malays , ▁Tor aja , ▁Chinese , ▁Bug is , ▁Mol u cc ans , ▁Mad ur ese , ▁Day aks , ▁Sul u , ▁Bur m ese ▁and ▁or ang ▁as li ▁until ▁they ▁spread ▁across ▁the ▁Indones ian ▁Arch ip el ago . ▁Their ▁heter ogeneous ▁systems ▁of ▁combat ▁are ▁term ed ▁sil