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Gyrn Ddu is a 522-metre hill in Gwynedd. It counts among the 1,546 Marilyns, British hills with at least 150 m of drop on every side. It stands within Llŷn National Landscape.
Yr Eifl and Mynydd Graig Goch are among the hills within 9.7 km. The closest station is Penychain, 10.6 km to the south.
More at hill-bagging.co.uk