Great Wall of China facts and comparisons
The Great Wall is a system of walls, trenches, towers, passes, and associated facilities built over centuries, not one uninterrupted wall with a single simple measurement.
Great Wall of China size comparisons
The official surveyed total is 21,196.18 kilometres.
That figure includes wall sections, trenches, individual buildings, passes, and related facilities, so it must never be presented as one continuous walkable wall.
Source: State Council Information Office
UNESCO describes the Great Wall heritage work as more than 20,000 kilometres long.
The rounded UNESCO description is useful when the page is not explaining the more detailed survey scope behind the 21,196.18-kilometre total.
Source: UNESCO
Construction continued from the 3rd century BC to the 17th century AD.
Its scale is therefore temporal as well as geographic: successive Chinese empires added and adapted defensive works over about two millennia.
Source: UNESCO
The surveyed system reaches across 15 provincial areas.
That geographic spread helps explain why a single city-scale comparison cannot describe the whole World Heritage property.
Source: State Council Information Office
The record includes more than 43,000 related historic sites and assets.
This is a survey-and-protection figure, not a count of identical wall segments.
Source: State Council Information Office
Its surviving fabric includes rammed-earth fortifications and Ming-period masonry.
That variety corrects the familiar but inaccurate shorthand that the whole Great Wall is made of the same kind of stone.
Source: UNESCO
