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The Jiumenkou Great Wall. The Jiumenkou Great Wall was a most important pass in Ji Town of the Ming Great Wall. It is located in the boundary of Wuning County in Hebei Province and Suizhong County in Liaoning Province, 15 kilometers to the south of Shanhaiguan. In the Jiujiang valley where the Great Wall passes through, there were built the Jiumen city bridge over the Jiujang River, besieged cities and ramparts, which altogether formed the unique strategic passes. Jiumenkou, also called ‘the stone pavement’, named after the granite paved riverbed of more than 7000 square meters under the Jiumen city bridge. In the slabs paved along the riverbed there were chiseled dovetail grooves that were tenoned and mortised with cast iron ingots in order to closely clutch all the slabs.
The city bridge over the Jiujiang River was the main project of Jiumenkou, both ends of which were connected with a small rectangle besieged city on the bank. The small city is 16 meters long from east to west, and was 12.2 meters wide. It protrudes from the city bridge, serving for the bridge tower and the advance guard blockage pass of the Jiujiang River. The eastern wall of it is connected with the city bridge, and is a border platform of the bridge pier on which a pavilion was built. On the other three sides of the city there are seven arch gun holes. The city is hollow and could hold more than ten defenders.
