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Hadrian's Wall was 80 Roman miles or 117.5 km (73.0 mi) long; its width and height varied according to the construction materials that were available nearby.
The Great Wall crosses plateaus, mountains, deserts, rivers and valleys, passing through five provinces and two autonomous regions. It averages about 20 feet wide and 26 feet high. Parts of the wall are so broad that 10 persons can walk across it side by side. Materials used for the wall, were whatever could be found near by; clay, stone, willow branches, reeds and sand. Parts of this wall can still be seen in remote parts of China.