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- Taeglin
- A tributary of Sirion. It rose in the southern reaches of the Ered Wethrin, ran generally southeast, receiving the waters of Glithui and Malduin, then passed along the southern margin of the Forest of Brethil, where it ran through a gorge named Cabed-en-Aras and then received the Celebros. The Taeglin then ran eastward into Sirion at the borders of Doriath.
- An important ford on the river was the Crossings of Teiglin, near the western border of Brethil. A road ran through it from Nargothrond to Minas Tirith. Minor tributaries were Celebros and Malduin. The river's banks near Celebros was the scene of the encounter between Túrin Turambar and the dragon Glaurung.
- In the published Silmarillion and early writings, the river was called Teiglin. As revealed in The History of Middle-earth, the river name should actually have been spelt Taeglin. This was a relatively late change which was not adopted by Christopher Tolkien in his published Silmarillion.
- Thalos
- A tributary of Gelion. It was the third from the north of the seven rivers that defined Ossiriand. Thalos sprang from the Ered Luin and at its springs Finrod met the first Men to enter Beleriand.
- Thistle Brook
- A stream of the Eastfarthing of the Shire. It flowed southeast round the Woody End and through the village of Willowbottom before its waters emptied into Shirebourn.
Read more about this topic: List Of Middle-earth Rivers