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Hirfynydd tops out at 482 m in Neath Port Talbot. It is listed among the 1,546 Marilyns — British hills with at least 150 m of drop on every side. Only one of the eight hills the Albion Guide maps in Neath Port Talbot stands higher.
Nearby hills include Craig y Llyn, Mynydd Marchywel and Mynydd Allt-y-grug. The closest station is Treherbert, 13.5 km to the south-east.
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