Ysgyryd Fawr
Ysgyryd Fawr is a Marilyn, 486m high, in the Bannau Brycheiniog / Brecon Beacons National Park, and also counts as a HuMP. The Marilyns are hills anywhere in Britain and Ireland with at least 150 metres of prominence, whatever their height.
Abergavenny is the nearest station, 3.3 mi (about 4.5 to 5 mi on foot): a full day on foot there and back. From Abergavenny it's about 2 to 2.5 hours to the summit, 1 in 13 on average. It is the only station within 10 miles. The Offa's Dyke Path National Trail passes 1.7 mi away.
Skirrid Fawr, often referred to as just the Skirrid, is a traditional Christian pilgrimage site and an easterly outlier of the Black Mountains in Wales. It forms the easternmost part of the Brecon Beacons National Park. The smaller hill of Ysgyryd Fach or "Little Skirrid" lies about 2+1⁄2 miles south.
Source: Wikipedia, CC BY-SA.
Stations within 10 miles of Ysgyryd Fawr, nearest first. Walking distances are estimates from the straight-line distance and the type of ground, not a measured route. Check a map before you set off. Times use Naismith's rule and don't include stops.