A modern city in Honan (Henan) province, China, the site of a large Bronze Age city, probably a capital of the Shang dynasty (Ao) belonging to the Erligang Phase. There were also Neolithic settlements in the area. A rammed-earth hangtu foundation of palace buildings is within a walled compound, dated c1500 BC. House foundations have been uncovered within the walled enclosure. Outside the wall are workshops for bronze, ceramics, and bone crafts and tombs with bronze ritual vessels. The nearby site of Erligang gives its name to the bronze vessel style at Zengzhou. The settlement declined sharply in importance after the Erligang phase. The Shang, who continually moved their capital, left Ao, perhaps in the 13th century BC. The site, nevertheless, remained occupied; Chou (post-1050 BC) tombs have also been discovered.