How long is the Ming Great Wall? - 8,851.8 km (5,500.3 mi) The Ming Great Wall is the best-preserved among all, extending from Hushan in Liaoning to Jiayuguan in Gansu. It includes 6,259.6-kilometer (3,889.5-mile) artificial wall, 359.7-kilometer (223.5-mile) trench and 2,232.5-kilometer (1,387.2-mile) natural barrier.