《尚书·夏书·禹贡》
渤海和泰山之间是青州：嵎夷治理好以后，潍水和淄水也已经疏通了。
海岱惟青州。嵎夷既略，潍、淄其道。
Between the Bohai Sea and Mount Tai was the state of Qing: after the eastern barbarians had been pacified, the Wei and Zi rivers had been dredged.