How far apart have the historic mouths of the Yellow River been?

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Throughout its geologic history, the Yellow River has shifted its course radically across the North China Plain as its riverbed has built up with sediment. Over the past four millennia, the historic mouths of the river have been as much as 500 miles (800 km) apart.12

These shifts have historically resulted in the river entering the Bo Hai in the north or the Yellow Sea to the south of the Shandong Peninsula. For example, from the 3rd millennium BCE to 602 BCE, the river flowed near present-day Tianjin into the Bo Hai, while in other periods, such as from 1289 to 1324, it entered the Yellow Sea well to the south of Shandong.2