Jiahu () was the site of a Neolithic settlement based in the central plain of ancient China, near the Yellow River. It is located between the floodplains of the Ni River to the north, and the Sha River to the south, north of the modern city of Wuyang, Henan Province. Most archaeologists consider the site to be one of the earliest examples of the Peiligang culture. Settled around 7000 BC, the site was later flooded and abandoned around 5700 BC. The settlement was surrounded by a moat and covered a relatively large area of 55,000 square meters (5.5 hectare). At one time, it was "a complex, highly organized Chinese Neolithic society", home to at least 250 people and perhaps as many as 800. The important discoveries of the Jiahu archaeological site include the Jiahu symbols, possibly an early example of proto-writing, carved into tortoise shells and bones; the thirty-three Jiahu flutes carved from the wing bones of cranes, believed to be among the oldest playable musical instruments in the world; and evidence of wine fermented from rice, honey and hawthorn leaves. A broad variety of other artifacts indicates a fairly advanced settlement for the early Neolithic period, including residences, burial sites, pottery kilns, an assortment of implements made of stone and earthenware, and a large central structure believed to be a communal workspace. To date, 45 residences have been excavated at Jiahu. Most of these are small, between four and ten meters. Most of these were semi-subterranean (partially dug into the earth) and with a single room; however, some of these had additional rooms built on later. Rubbish pits and storage cellars were also excavated, and nine pottery kilns were identified. Discovery and excavation of the site Discovered by Zhu Zhi in 1962, extensive excavation of the site did not occur until the 1980s. Most of the site still has not been excavated, although work is slowly progressing. The excavation of Jiahu burial sites and rubbish pits has been productive, yielding abundant evidence about the lives of the Jiahu people. Chinese researchers from the Henan Provincial Institute of Cultural Relics and Archaeology, led for many years by Zhang Juzhong, a professor from the University of Science and Technology of China, have carried out archaeological research around the site for decades. Zhang's team conducted excavation of portions of the site in seven stages; each stage took two to three years. A