Mouths of Entwash

The river Entwash was the greatest of the tributaries of Anduin, and where the two rivers met, a mighty delta formed, measuring a hundred miles from the splitting of the Entwash to its final inflow into the Great River. This delta formed the Mouths of Entwash.

So great was the inrush of Entwash that Anduin could not carry all its water, and so a marshland formed on Anduin's eastern bank, called Nindalf, or Wetwang in the Westron tongue.