River Garw

The River Garw rises in the hills north of Blaengarw and flows for about twelve kilometres through the valleys of the Garw to join the River Ogmore at Aberkenfig. It passes villages such as Pontycymer, Pantygog and Llangeinor, each set on the valley sides above the water. The river’s Welsh name, Afon Garw, means ‘rugged river’, describing the steep slopes and narrow valley it carves. The river once carried coal dust and chemicals from long-closed pits, turning its waters black and earning the local name ‘Black River’. Salmon once swam here, but they vanished with industrialisation; now, after mine closures and restorative work, they are slowly returning. The valley also holds Bryngarw Country Park, a managed nature reserve where many birds can be seen. Visitors walk the valley paths and watch the tributary streams that feed the Garw. One brook above Pontycymer has a small waterfall and the remains of a former reservoir. Another, Nant Forch Wen, once supplied Pontycymer’s swimming baths, closed in the 1970s after a polio scare. After heavy rain the river can burst its banks, flooding playing fields and low areas, though most villages stand safely above the valley floor.