Đại La (7th to 9th Century) - Ha Noi
Major archaeological work on Thăng Long was started in December of 2002 and continued into 2003 at 18 Hoàng Diệu street, which is located somewhere in the central area of the former citadel. The site excavated was 48,000 square meters and was divided in to 4 sections labeled A, B, c, and D. The site itself proved to be quite astonishing in that the soil held several layers of cultural relics right on top of each other, stretching from the 7th century right to the 19th. This makes the site quite notable in that there are very few sites like it in the world where a single location holds such a complete and continuous archaeological record. Millions of artifacts were uncovered giving insight into life at the time, how buildings were constructed, and even the influence of other nations through the presence of foreign made objects being found.
Paving stones were also found 15 drainage systems made from rectangular bricks were found in excavations and are around 60 meters in length.The wells that were discovered are all round and built with grey bricks in the Chinese style, demonstrating the influence that China had in this period. Of the 7 wells found, the deepest was 5.9 meters deep and evidence suggests that it was used well into the Lý period. One particularly important discovery was the finding of ceramics that originated in Western Asia. These discoveries show that the region was a part of trade routes between China and the Islamic world.
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