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Mynydd Sylen rises to 284 m (932 ft) in Carmarthenshire. It counts among the 1,546 Marilyns, British hills with at least 150 m of drop on every side. The nearest other hill is Mynydd Llangyndeyrn, 6.2 km to the north-west. The nearest railway station is Pontarddulais, 8.2 km to the south-east.
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