List of rivers of Wales

Tributaries are listed down the page in an upstream direction, starting with those closest to the sea.

[1] Certain names are encountered frequently and particular care should be taken to differentiate between the various occurrences of Clydach, Clywedog and of Dulas for example as well as those whose names refer perhaps to the colour of their waters e.g. Afon Goch (red river), Afon Ddu (black/dark river) and Afon Wen (white/light river).

From Dee Estuary to Garth Pier, Bangor, Gwynedd Anticlockwise from Menai Bridge / Porthaethwy The Afon Braint bifurcates near Llanfairpwllgwyngyll to form two different watercourses.

Note "Afon Menai", known as the "Menai Strait" in English, is not technically a river, despite its Welsh name.. From Bangor Pier to the tip of the Llŷn Peninsula From the tip of the Llŷn Peninsula to St. David's Head From St David's Head to St. Govan's Head From St. Govan's Head to M48 Bridge With the exception of a small part of the Rea Brook, all tributaries of the Severn downstream of the confluence of the Severn and the Vyrnwy are wholly in England.

That rivers are partly fractal in nature accounts for some variation and lengths can also vary slightly over time as meanders expand or are cut off where rivers run through broad flood-plains.