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| Image Credit : Antiquity |
The Discovery
Archaeologists investigating the Chengba archaeological site in Quxian County, eastern Sichuan Province, have uncovered extensive remains of a major urban settlement dating back around 2,000 years.
The city covers approximately 50,000 square metres and was enclosed by a gated wall measuring around 725 metres in circumference. A moat surrounded the settlement, while streets and building foundations have been identified within its boundaries.
The wider archaeological landscape is equally revealing.
Researchers have found evidence of a cemetery, pottery production and a riverside dock, suggesting that Chengba combined residential, administrative, industrial and trading functions.
The city's earliest known walls appear to have been constructed during the early Western Han Dynasty, between 202 and 141 BC. Several subsequent repair phases indicate that the fortifications remained in use as the settlement developed.
Chengba is particularly significant because it is the first Han Dynasty city identified in eastern Sichuan. Other known Han urban sites in the province are concentrated mainly around the Chengdu Plain.
What Archaeologists Found
The excavations have revealed evidence for a complex urban centre rather than a simple fortified settlement.
Inside the walls, archaeologists have identified streets and foundations, while different areas outside the city provide evidence for specialised activities.
More than 20,000 pieces of iron-smelting debris have been recovered, including slag, furnace lining and tuyeres — ceramic or other heat-resistant nozzles used to force air into furnaces.
Radiocarbon dating indicates that iron production continued from the late Western Han into the middle of the Eastern Han Dynasty.
The site has also produced bronze objects, inscribed roof tiles and a bronze musical instrument.
Some of the bronze ritual vessels and weapons predate the Han Dynasty. Their Warring States-period dates suggest that Chengba was already an important centre before the area was incorporated into the Qin and Han political systems.
The evidence therefore points to a settlement with a much longer history than the surviving Han-period city alone might suggest.
Historical Background
The earlier phase of Chengba appears to extend into the Warring States Period.
Bronze objects from this period have led researchers to associate the settlement with ancient “Cong City”, although the evidence for this identification belongs to an earlier phase of the site's history.
During the Han Dynasty, historical sources record the establishment of Dangqu County within Ba Commandery.
The possibility that Chengba was Dangqu has become one of the most important questions arising from the excavations.
Large numbers of roof tiles discovered at the site carry inscriptions containing the characters for “Dangqu”.
When those inscriptions are considered alongside historical descriptions of Dangqu's probable location, researchers say it is “very likely” that Chengba represents the ancient Dangqu City of the Western Han Dynasty.
The settlement's geography would also help explain its importance.
Chengba stands on the eastern bank of the Qujiang River, which flows into the Jialing River and eventually the Yangtze.
To the north, the Micang Pass provided a route through the Daba Mountains towards China's Central Plains.
The combination of river transport and mountain routes therefore created an important communications corridor through terrain where overland travel could otherwise be difficult.
Scientific Analysis
The archaeological investigation is combining architectural evidence, inscriptions, scientific dating and documentary material to reconstruct Chengba's development.
Radiocarbon dating of the iron-production remains indicates that smelting continued from the late Western Han into the middle Eastern Han period.
The chronological evidence supports the interpretation of Chengba as a settlement that remained active across multiple phases of Han rule.
The site has also produced bamboo documents containing information about finance, judicial affairs and education. Some texts concern calligraphy, literature and arithmetic, while others provide information relating to household registration.
The household-registration documents are particularly notable because this category of Han Dynasty bamboo document is rarely recovered in China.
Together, the documents could provide evidence for how local government operated, how education was organised and how households were recorded during the Western Han period.
The physical layout of the settlement may provide another layer of information.
The identification of separate residential, industrial and administrative areas could allow researchers to examine how a Han county-level city was organised spatially.
Why This Discovery Matters
Chengba could fill an important archaeological gap in the understanding of Han urban development in eastern Sichuan.
The settlement appears to have combined administration, manufacturing and trade within a fortified urban centre connected to both river and mountain routes.
Its location also provides a possible explanation for its longevity.
From the late Warring States Period through the Qin and Han dynasties, the settlement occupied a position linking the Central Plains with the middle reaches of the Yangtze River.
The discovery of extensive iron production is particularly important. More than 20,000 pieces of industrial debris indicate that Chengba was not simply an administrative centre but also a significant manufacturing location.
The bamboo documents add another dimension by potentially preserving information about government, education and household registration.
Could Chengba's combination of river transport, mountain routes, administration and industry explain why the settlement remained important for centuries?
What's Next?
The most intriguing feature still requiring further investigation is the proposed Han Dynasty “water gateway”.
Archaeologists have identified a dock area beside the Qujiang River, north-west of the ancient city. Its position, combined with information from bamboo slips recovered nearby, has led researchers to suggest that the site may have functioned as a combined land and water gateway.
Officials may have used it to inspect travellers and boats while regulating resources and the movement of traded goods.
If that interpretation is confirmed, researchers say it would be the only Han Dynasty water gateway discovered so far in China.
Further excavation will also seek to identify additional parts of Chengba and establish a more detailed chronology for the settlement.
Researchers will be able to compare the city's physical layout with the documentary evidence preserved on the bamboo slips and inscribed roof tiles.
That work should help test the proposed identification with Dangqu and clarify how the city's administrative, residential and industrial zones developed.
Conclusion
The Chengba archaeological site is revealing the remains of a substantial Han Dynasty urban centre in eastern Sichuan, complete with fortified walls, a moat, streets, workshops and a riverside dock.
Inscribed roof tiles provide an important clue linking the settlement with Dangqu County, while bamboo documents offer rare evidence for Han administration, education and household registration.
The discovery of more than 20,000 pieces of iron-smelting debris also demonstrates the site's industrial importance.
Most intriguingly, a riverside structure may represent a Han-era water gateway — an interpretation that, if confirmed, would be unique among known discoveries in China.
As excavation continues, Chengba could provide a detailed archaeological picture of how a strategically positioned Han city functioned at the intersection of rivers, mountains, trade and government.
FAQ
Where is the Chengba archaeological site?
Chengba is in Quxian County in eastern Sichuan Province, south-west China. The site lies on the eastern bank of the Qujiang River.
Could Chengba be the ancient city of Dangqu?
Researchers consider this very likely based on inscribed roof tiles bearing the characters for “Dangqu”, combined with historical and geographical evidence. The identification remains an archaeological interpretation under further investigation.
What is the possible Han Dynasty water gateway?
It is a riverside structure beside the Qujiang River that researchers believe may have functioned as a combined land and water checkpoint. If confirmed, researchers say it would be the only known Han-era water gateway discovered in China.
What was produced at Chengba?
The site contains extensive evidence of iron production, including more than 20,000 fragments of slag, furnace lining and tuyeres. Pottery, bronze objects and other artefacts show that the settlement also supported craft and administrative activities.
