It rises at an altitude of around 1,800 ft (549 m) on the south east slopes of Moel Fferna in the Berwyn Mountains, and flows through the Ceiriog Valley in Wrexham County Borough.
Home to a trout fishing club, the river and its valley were described by British prime minister David Lloyd George as "a little bit of heaven on earth".
[4] Due to its steep gradient and juvenile nature the river can be wild at times and has been named as the fastest flowing in Wales.
[5] On 16 July 2013, a 21-year-old man was found drowned on a stretch of the river near where it meets the Dee.
[6] Natural Resources Wales (Cyfoeth Naturiol Cymru)) monitors the river levels at the estate of Brynkinalt.