194973
Sa Huynh sites were rich in locally-worked iron artefacts , typified by axe s , sword s , spear heads , knives and sickle s. In contrast , bronze artefacts were dominant in the Dong Son culture sites found in northern Vietnam and elsewhere in mainland Southeast Asia .
 Vietnam
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Vietnam