River Llynfi

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The River Llynfi (Afon Llynfi in Welsh) is one of three main tributaries of the River Ogmore. It runs for around 10 miles from its source north of Maesteg to the confluence with the River Ogmore and the River Garw at Aberkenfig.

The Llynfi has endured a long period of industilisation and coal mining especially around Maesteg. There was an iron works and brick works at Tondu.

Industrialisation and poor provision of sewerage led to severe pollution of the river. In the second half of the 20th century, whilst the impact of coal diminished, new industries such as cosmetics and toiletries, paper making and sewage disposal continued to maintain the Llynfi in an almost abiotic condition. Strong enforcement action against a number of industries helped to ensure a steady improvement in quality into the 21st century.

• Map sources for: the source on Mynydd Caerau and confluence with the Ogmore.