Sediments are present along much of the Korean and Chinese coastline. This is particularly evident on the border between China and North Korea, where the Yalu River (Chinese) or Amnok River (Korean) is discharging a dense brown cloud of silt into the Korea Bay.
From 2,500 m above sea level on Baekdu Mountain, in the Changbai mountain range, on the China-North Korea border, the river flows south to Hyesan before sweeping 130 km northwest to Linjiang. It then returns to a more southerly route for a further 300 km to empty into the Korea Bay between Dandong (China) and Sinŭiju (North Korea).
The river is 790 km (491 mi) long and receives the water from over 30,000 km2 of land. The Yalu’s most significant tributaries are the Changjin, Heochun and Tokro rivers.
The river is not easily navigable for most of its length: although at its widest it is around 5 km, the depth is no greater than 3 m and much of the river is heavily silted.