|Native name||Afon Cuch|
|River mouth||River Teifi|
|Length||13 km (8.1 mi)|
|River system||River Teifi|
Afon Cych (standard Welsh orthography: Afon Cuch) is a tributary of the River Teifi in south-west Wales. It is 13 km long, passes through a number of small settlements on the border between Pembrokeshire and Carmarthenshire, and is significant in Welsh legend.
Its "official" source (although not its highest headwater) is at Blaencych.
The river flows north-westwards through a deep, wooded, secluded valley, and joins the River Teifi at Abercych . Its total length is 13 kilometres (8.1 mi). It receives numerous small tributaries: the Sylgen, Barddi, Mamog, Dwrog and Lŵyd on the east side, and the Pedran, Cneifa and Dulas on the west side. It formed the ancient boundary between the commotes of Emlyn Is Cuch and Emlyn Uwch Cuch, and it today forms part of the boundary between Pembrokeshire and Carmarthenshire.
The river runs through the small settlements of Cwmorgan and Cwmcych, and the village of Abercych.
The Cych is crossed by a number of bridges including (from upstream) Pont Cwmorgan, Pont Wedwst, Pont Newydd, Pont Cych at Cwmcych (built in 1737 and Grade II listed), an unnamed bridge by Bridgend, Pont Glancych and Grade II listed Pont Treseli which carries the B4332 road at Abercych and has perforated spandrels similar to Cenarth Bridge.
The valley (Glyn Cuch) is well known in Literature of Wales (Welsh language) as the place where, in the Mabinogion, Pwyll Pendefig Dyfed has his fateful meeting with Arawn, Lord of the Underworld. Boundary streams were often thought of as portals to the underworld.
- "Dyfed Archaeological Trust: Abercych". Retrieved 1 April 2015.
- "Dyfed Archaeological Trust: Afon Teifi - Llechryd to Cenarth". Retrieved 1 April 2015.
- "British listed buildings: Pont Cych". Retrieved 3 February 2016.
- "British listed buildings: Pont Treseli". Retrieved 4 February 2016.
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