What does the great wall of china divide?

"The Great Wall of China is one of the greatest sights in the world, the longest wall in the world, an awe-inspiring feat of ancient defensive architecture. Its winding path over a rugged country and steep mountains take in some great scenery. The Great Wall of China has a history of more than 2,300 years. The Great Wall of China’s history began in the Spring and Autumn Period (770–476 BC) and was last rebuilt as a defense in the Ming Dynasty (1368–164. The length of the Great Wall of China is 21,196.18 km (13,170.7 mi), half the equator! The first emperor of China, Qin Shi Huang took the remnants of ancient fortifications, walls, and earthworks and linked them into a unified wall circa 220 B.C. The Great Wall is the largest man-made project in the world. The complete route is over 20,000 km, stretching from the east seaside to the west desert in northern China, winding up and down across mountains and plateaus like a dragon."

"The Great Wall is a massive monument built with different materials. Most of the sections we see today were built with bricks and cut stone blocks, and lime mortar was used to hold the bricks together. It is not not a single-structured wall, it includes beacon towers, barriers, barracks, garrison stations, and fortresses along the walls, together forming an integrated defense system"

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