1
Chang'an (Tang Dynasty)
- Perimeter (km)
- 35.5
- Civilization/Era
- China, Tang Dynasty

This ranking highlights the ancient capital cities with the longest recorded fortified wall perimeters in human history. The ranking is based on measurements of the outer perimeter during the height of these cities, representing the scale of imperial power, centralized planning, and architectural ambition of ancient civilizations.
The perimeter of ancient capital walls often mirrored the administrative reach and military requirements of the empires they served.
| Rank | Name | Perimeter (km) | Civilization/Era |
|---|---|---|---|
| 1 | Chang'an (Tang Dynasty) | 35.5 | China, Tang Dynasty |
| 2 | Nanjing City Wall (Ming) | 35.3 | China, Ming Dynasty |
| 3 | Beijing (Inner+Outer) | 30 | China, Ming-Qing |
| 4 | Constantinople | 20 | Byzantine Empire |
| 5 | Kaifeng (Bianliang) | 19.5 | China, Northern Song |
| 6 | Babylon | 18 | Ancient Babylon |
| 7 | Aurelian Walls (Rome) | 19 | Roman Empire |
| 8 | Luoyang | 17.5 | China, Sui-Tang |
| 9 | Long Walls of Athens | 16 | Ancient Greece |
| 10 | Ani | 15 | Kingdom of Armenia |
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