The Hemudu culture was a Neolithic culture that flourished just south of the Hangzhou Bay in Jiangnan in modern Yuyao, Zhejiang, China. The culture may be divided into early and late phases, before and after 4000 BC respectively. The site at Hemudu, 22 km northwest of Ningbo, was discovered in 1973. Hemudu sites were also discovered at Tianluoshan in Yuyao city, and on the islands of Zhoushan. Hemudu are said to have differed physically from inhabitants of the Yellow River sites to the north. Some authors propose that the Hemudu Culture was a source of the pre-Austronesian cultures.

Jiangnan is a geographic area in China referring to lands immediately to the south of the lower reaches of the Yangtze River, including the southern part of its delta. The region encompasses the city of Shanghai, the southern part of Jiangsu Province, the southeastern part of Anhui Province, the northern part of Jiangxi Province and the northern part of Zhejiang Province. The most important cities in the area include Anqing, Changzhou, Hangzhou, Nanjing, Ningbo, Shaoxing, Suzhou, Wuxi, Wenzhou, Yangzhou and Zhenjiang.