The Relics Site Management Board said the project costing over VND27 billion (roughly US$1.5 million) would cover survey, research, zoning and evaluation of the site to work out the most suitable way of conserving it. 

A website will also be launched to help collect information on the site. 

Located in Hanoi’s suburbs, the Co Loa citadel is a mixture of architectural styles, dating back to different stages of Vietnamese history, from the stone to the bronze and iron ages.