These resources were overstrained in the completion of the Grand Canal, and in the undertaking of other construction projects, including the reconstruction of the Great Wall.
3
山海关以东筑入渤海的长城名为老龙头，是明长城东部起点。
The section east of Shanhaiguan that dips into Bohai Sea is called Laolongtou, which is the east start of the Great Wall.
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