Penpergwm is a village in south Wales, situated along the A40 road, 3.9 miles (6.3 km) south-east of Abergavenny and 14 miles (23 km) west of Monmouth. The site of Castell Arnallt lies on a mound in the water meadows between the village and the River Usk.
The village used to have to a railway station on the Welsh Marches Line, but it closed in 1958. The former station house is now a private residence.
The former British politician Francis Pym was born in Penpergwm Lodge in the village.
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