| Afon Tarell | |
| Name Other: | River Tarell |
| Subdivision Type1: | Country |
| Subdivision Name1: | United Kingdom, Wales |
| Subdivision Type3: | Region |
| Subdivision Name3: | South Wales |
| Subdivision Type4: | County |
| Subdivision Name4: | Powys |
| Length: | 20km (10miles) |
| Discharge2 Location: | River Usk |
| Source1 Location: | Pen y Fan, Powys, Wales |
| Source1 Coordinates: | 51.8668°N -3.4889°W |
| Source1 Elevation: | 562m (1,844feet) |
| Mouth: | River Usk |
| Mouth Location: | Brecon, Powys, Wales |
| Mouth Coordinates: | 51.9496°N -3.4°W |
| Mouth Elevation: | 135m (443feet) |
| Tributaries Right: | Nant Cwm Llwch |
The Afon Tarell is a river in Powys, Wales, which rises to the west of the Brecon Beacons in Brecon Beacons National Park and flows north, then north-east, for 12miles into the River Usk.
The river is followed for its entire length through Glyn Tarell (the Tarell valley) by the A470 road, passing by the hamlets of Libanus and Tai'r Bull and entering the Usk at Llanfaes on the southern edge of Brecon.
The most significant tributary of the river is Nant Cwm Llwch, which enters the Tarell on its right bank between Tai'r Bull and Llanfaes. This secondary river emerges from the glacial lake of Llyn Cwm Llwch beneath Pen y Fan.[1]
The name may have its origins in the old Welsh language words tarddu, "to bubble out", and tarddell, "a spring or source".[2]
The Afon Tarell, in common with the Usk and its other tributaries, is designated as a special area of conservation for its three species of lamprey, twaite shad, European bullhead, Atlantic salmon and otter.[3]