The Great Wall is a network, not one wall
The Great Wall of China is a system of fortifications built and rebuilt across different regions and dynasties.

Why it is true
The World Heritage property includes walls, watchtowers, shelters, fortresses, and passes. Construction stretched across many centuries rather than following one continuous plan.
Check the source
We keep the original reference beside the claim so you can inspect the evidence and surrounding context yourself.
Open UNESCO World Heritage Centre