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In J. R. R. Tolkien's fictional universe of Middle-earth, the Entwash was a great river in Rohan, notable for its huge inland delta.
The Entwash, known in Sindarin as Onodló, had its sources in the springs that arise on Mount Methedras, last peak of the Misty Mountains, arising near Treebeard's home.
Leaving Fangorn forest, the river flowed past the Wold of Rohan, and then heades south, dividing Rohan between West- and East Emnet. At the latitude of Edoras it was joined by the river Snowbourn, and then flowed west towards Anduin, which it joined just south of the Falls of Rauros, in the huge inland delta known as the Mouths of the Entwash. The Mering Stream or Glanhír met one of the Entwashes' arms there. The influence of water was so great that at the other end of the Anduin the marshes of Nindalf (Wetwang) and the Dead Marshes arose.
The Entwash was named for the Ents of Fangorn, but the origin of the name was largely forgotten by the Rohirrim.
