However, government-sponsored investigations that began in the 1990s revealed sections of wall in Liaoning, and aerial and satellite surveillance eventually proved that this wall stretched continuously through much of the province.The greater total length of the Ming wall was announced in 2009.The most extensive and best-preserved version of the wall dates from the Ming dynasty (1368–1644) and runs for some 5,500 miles (8,850 km) east to west from Mount Hu near Dandong, southeastern Liaoning province, to Jiayu Pass west of Jiuquan, northwestern Gansu province.
In the Yan state two separate defensive lines were prepared—the Northern Wall and the Yishui Wall—in an effort to defend the kingdom from attacks by northern groups such as the Donghu, Linhu, and Loufan, as well as by the Qi state in the south.
The Yishui Wall was expanded from the dike of the Yi River as a defense line against Qi and Zhao, its two main rival states.
From the 6th to the 4th century other states followed Chu’s example.
In the southern part of the Qi state an extensive perimeter wall was gradually created using existing river dikes, newly constructed bulwarks, and areas of impassable mountain terrain.
Nearly all of the rest (about 70 percent of the total length) is actual constructed wall, with the small remaining stretches constituting ditches or moats.
China Essay Great Wall
Although lengthy sections of the wall are now in ruins or have disappeared completely, it is still one of the more remarkable structures on Earth. C., under Qin Shi Huang, sections of earlier fortifications were joined together to form a united defence system against invasions from the north.Its historic and strategic importance is matched only by its architectural significance.The state of Zhao completed a southern wall and a northern wall; the southern wall was built mainly as a defense against the Wei state.), the Qin state grew politically and militarily to become the strongest among the seven states, but it was frequently raided by the Donghu and Loufan, two nomadic peoples from the north.Therefore, the Qin erected a wall that started from Lintiao, went north along the Liupan Mountains, and ended at the Huang He (Yellow River).There were two defensive lines in the Wei state: the Hexi (“West of the [Yellow] River”) and Henan (“South of the River”) walls.The Hexi Wall was a fortification against the Qin state and western nomads.Great Wall of China, Chinese (Pinyin) Wanli Changcheng or (Wade-Giles romanization) Wan-li Ch’ang-ch’eng (“10,000-Li Long Wall”), extensive bulwark erected in ancient China, one of the largest building-construction projects ever undertaken.The Great Wall actually consists of numerous walls—many of them parallel to each other—built over some two millennia across northern China and southern Mongolia.The Great Wall was designated a UNESCO Shihuangdi (Qin Shihuang), the first emperor of a united China (under the Qin dynasty), connected a number of existing defensive walls into a single system.Traditionally, the eastern terminus of the wall was considered to be Shanhai Pass (Shanhaiguan) in eastern Hebei province along the coast of the Bo Hai (Gulf of Chihli), and the wall’s length—without its branches and other secondary sections—was thought to extend for some 4,160 miles (6,700 km).