Lower Clydach River

The Lower Clydach River is a river in South Wales which rises on the slopes of Mynydd y Betws west of Cwmgors and flows for around 10 km through Cwm Clydach to its confluence with the River Tawe at Clydach. It runs through the RSPB's Cwm Clydach [RSPB Reserve|Cwm Clydach Nature Reserve] just to the north of Clydach. -.
Each of the rivers bearing the name 'Clydach' in South Wales is thought to derive from an earlier Celtic word 'klou' or 'kleu' together with the suffix '-ach' which is of Irish origin. The sense is of a 'strong-flowing', 'washing' or stony river.