Mynydd Llysiau

Perched between Waun Fach and Pen Allt-mawr, Mynydd Llysiau—the 'Mountain of Herbs'—is a grassy haven with a deceptively steep eastern drop. It’s the perfect spot for those who enjoy dramatic escarpments and wondering if they’ve accidentally wandered onto a very high-altitude farm.

• •The name translates from Welsh as 'Mountain of Herbs,' though modern hikers are more likely to find wind-blasted moss than a medicinal garden. It remains a key link in the long, undulating ridge walks that define the Black Mountains.
• •Two ancient boundary stones sit just to the south, standing upright like eerie, miniature gravestones. These monoliths traditionally marked the division between the old counties of Breconshire and Monmouthshire, providing a bit of historical gravitas to the moorland.
• •The fell features a dramatic eastern face that plunges toward the valley below, contrasting sharply with its gentle western slopes. This asymmetry is typical of the Old Red Sandstone plateaus found throughout this south-eastern corner of Wales.
• •The summit is marked by a humble pile of stones on a broad, grassy ridge that can feel endless in thick mist. It is often bypassed by those rushing toward Waun Fach, making it a peaceful refuge for the less hurried rambler.
• •Navigating the approaches requires a black belt in 'bog-hopping' to avoid the notorious peat hags that guard the ridge. You will likely finish the walk with boots several pounds heavier and a new-found respect for the buoyancy of Welsh mud.