禹貢
The Records of the Grand Historian recount that once Yu the Great had finished taming the floods that once engulfed the land, he divided the territory into the Nine Provinces and collected bronze in tribute from each one. Thereafter he cast the metal into nine large tripod cauldrons. Legend says that each ding weighed around 30,000 catties equivalent to 7.5 tons. However, the "Zuo Zhuan" or "Commentary of Zuo", states that the nine tripod cauldrons were cast by Yu the Great's son, Qi of Xia, the second Xia Emperor, and it was he who received the tributes of bronze from the Nine Provinces. The "Xia Shu" () section of the Book of Documents contains the "Yu Gong" or "Tribute of Yu" that describes the rivers and mountains of the Nine Provinces.