What is the total measured length of the Great Wall of China?

The total measured length of the Great Wall of China is 21,196 kilometres.

This figure comes from a 2007 survey by China’s State Administration of Cultural Heritage. It counts the wall’s many sections and branches, along with trenches and natural defensive barriers included in the official measurement. The result is much larger than the length of the best-preserved Ming-era wall alone.

The Great Wall is not one continuous structure built at one time. States in ancient China constructed and maintained separate defensive walls, and later dynasties connected, rebuilt, or extended them. The Ming dynasty created many of the brick and stone sections most visitors recognize today, especially near Beijing.

A frequently quoted alternative figure of 8,851.8 kilometres refers specifically to the Ming wall system in the 2009 survey, not the entire historical network. The wall was built for defense, border control, signaling, and regulating movement, rather than as an impenetrable barrier. It is a vast cultural landscape made from different materials across different eras.