The Yellow River Delta is one of the most unstable deltas globally, with frequent river bank bursts and channel shifts. Over the past 3000 years, the river mouth has moved 600 km, forming ancient deltas along the Bohai Sea and Yellow Sea. The modern delta has shifted nine times in 137 years due to factors like tectonism, sea level changes, and basin features. The delta's instability is influenced by the China-plate's movements and the drainage area's characteristics.