"This is the longest monument [~200 km] in Southeast Asia," CNN.com quoted Professor Phan Huy Le, president of the Vietnam Association of Historians, as saying. The wall is built of alternating sections of stone and earth, with some sections reaching a height of up to four meters...Today I found at the BBC another report, this time with a photo (above, copyright EFEO). A quick search yielded a couple more low-resolution photos (here and here) -
Construction of the Long Wall started in 1819 under the direction of Le Van Duyet, a high-ranking mandarin serving Emperor Gia Long, and it served to demarcate territory and regulate trade and travel between the Viet in the plains and the Hre tribes in the mountain valleys.
23 April 2011
The Great Wall of Vietnam
report that archaeologists were working to uncover and preserve the "Great Wall" of Vietnam -