The GPIAC controls half a mile of single bank and three quarters of a mile double bank of this sparkling stream which contains trout, grayling and coarse fish with a good run of salmon in the Autumn. After a flood it is usually fishable before the Wye and is often more sheltered than the Wye in windy weather.
The Afon Irfon’s source is 540 metres above ordnance datum on the upper slopes of Bryn Garw in the Cambrian Mountains. From here, it flows south past the foot of the Devils Staircase, along the Abergwesyn Valley through the scenic Camddwr Bleiddiad (Wolves' Gorge), into the Wolves Pool. It then proceeds past the forest of Sessile Oaks to join the Afon Gwesyn at Abergwesyn where it passes beneath the Irfon Forest and the Nant Irfon National Nature Reserve towards Llanwrtyd Wells. Onward it flows, eastward through Llangamarch Wells and Garth, to ultimately form its confluence with the River Wye at Builth Wells (see the Aber Pool on the Map of our Waters). The source of the Irfon is in the so called ‘Desert of Wales’.
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