---
id: kb-2026-00459
title: Great Wall of China
schema_type: TechArticle
category: history
language: en
confidence: medium
last_verified: '2026-05-28'
created_date: '2026-05-22'
generation_method: ai_structured
ai_models:
  - claude-opus
derived_from_human_seed: true
conflict_of_interest: none_declared
is_live_document: false
data_period: static
atomic_facts:
  - id: fact-great-wall-01
    statement: The Great Wall of China is a series of defensive fortifications in northern China, with early sections dating to ancient Chinese states and major rebuilding under later dynasties.
    source_title: Great Wall of China - Britannica
    source_url: https://www.britannica.com/topic/Great-Wall-of-China
    confidence: medium
  - id: fact-great-wall-02
    statement: Surveys commonly report the total length of all Great Wall sections, including branches and rebuilt stretches, at about 21,196 kilometers.
    source_title: Great Wall of China - Britannica
    source_url: https://www.britannica.com/topic/Great-Wall-of-China
    confidence: medium
  - id: fact-great-wall-03
    statement: UNESCO inscribed the Great Wall as a World Heritage property in 1987.
    source_title: The Great Wall - UNESCO World Heritage Centre
    source_url: https://whc.unesco.org/en/list/438
    confidence: medium
completeness: 0.82
known_gaps:
  - Regional conservation status and detailed dynasty-by-dynasty archaeology are not exhaustively covered.
disputed_statements: []
primary_sources:
  - title: Great Wall of China - Britannica
    type: reference
    year: 2026
    url: https://www.britannica.com/topic/Great-Wall-of-China
    institution: Encyclopaedia Britannica
  - title: The Great Wall - UNESCO World Heritage Centre
    type: official_record
    year: 1987
    url: https://whc.unesco.org/en/list/438
    institution: UNESCO
secondary_sources:
  - title: The Great Wall
    type: book
    year: 2008
    authors:
      - Man, John
    url: https://www.hachettebookgroup.com/titles/john-man/the-great-wall/9780306817670/
    institution: Da Capo Press
---

## TL;DR

The Great Wall is not one continuous wall. It is a set of defensive walls, passes, towers, and related fortifications built and rebuilt across northern China over many centuries.

## Core Explanation

The best-publicized measurement treats the full system, including branches and rebuilt portions, as about 21,196 kilometers. Surviving and restored Ming-era sections near Beijing are the best known to visitors, but the broader system includes older earthen walls and later brick-and-stone construction.

## Evidence Notes

The total-length claim is sourced to Britannica rather than a travel site, and the World Heritage status is sourced directly to UNESCO. This article avoids the common but weakly sourced claim that the wall is visible from the Moon.

## Further Reading

- [Great Wall of China - Britannica](https://www.britannica.com/topic/Great-Wall-of-China)
- [The Great Wall - UNESCO World Heritage Centre](https://whc.unesco.org/en/list/438)

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