The Irfon defines the northern limit of the Mynydd Epynt area between Llanwrtyd Wells and Builth Wells . Irfon defines the northern border of the Mynydd Epynt area between Llanwrtyd Wells and Builth Wells .
Irfon mentakrifkan had utara kawasan Mynydd Epynt antara Llanwrtyd Wells dan Builth Wells. Irfon mentakrifkan sempadan utara kawasan Mynydd Epynt antara Llanwrtyd Wells dan Builth Wells.