Llangynidr Trig and Chartist Cave, Black Mountains

Hiking

Walking

Posts from OS Champions

Coffee Bag Adventures

Llangynidr Trig and Chartist Cave, Black Mountains

Distance

15.8km

Time

5hrs

Difficulty

Medium

Open in OS Maps

Print this route

Published on March 17, 2025

3 min read

Llangynidr Trig – Panoramic Views from the High Ground

The walk begins with a steady climb onto the open moorland of Mynydd Llangynidr, where you’ll soon reach the trig point at 557m. This elevated spot offers panoramic views over the Usk Valley, Bannau Brycheniog (Brecon Beacons) and towards the Black Mountains. The rolling limestone landscape is vast and exposed, with a sense of remoteness that adds to the adventure.

A Landscape Shaped by Quarrying

As you descend from the high ground, the terrain takes on an almost lunar quality, with large areas of spoil heaps and scattered sinkholes. This rugged landscape is the result of centuries of limestone quarrying, which was once a major industry in the area. The land here has been shaped by human hands, leaving behind craters, ridges, and scarred rock formations that contrast starkly with the surrounding moorland.

While nature has begun reclaiming some of these sites, the remains of old quarries are still a stark reminder of the industry that once thrived here, supplying stone for construction, agriculture, and even iron production. The uneven terrain, peppered with sharp ridges and dips, makes for an atmospheric and almost surreal walking experience.

Chartist Cave – A Hidden Landmark of Welsh Democracy

Continuing across the moors, you’ll reach one of the most historically significant caves in Wales – the Chartist Cave (Ogof Fawr). This natural limestone cavern played a crucial role in the Chartist movement of the 19th century, a working-class campaign for voting rights and political reform.

In the 1830s, this cave became a secret meeting place for Chartist rebels, who gathered here to plan their uprisings. Legend has it that weapons were stored inside, ready for the march on Newport in 1839 – an event that ended in bloodshed but remains a pivotal moment in the struggle for democracy. Standing at the entrance to the cave, it’s easy to imagine the whispers of revolutionaries echoing through the limestone walls.

A Striking and Atmospheric Walk

This challenging yet rewarding route offers a unique mix of history, geology, and expansive wilderness. From the windswept heights of Llangynidr, through the quarry-scarred landscapes, to the radical past of the Chartist Cave, every step tells a story. The vast openness of the terrain, combined with the remains of human industry and the echoes of political struggle, make this a truly atmospheric walk through time and nature.

Perfect for those with a love of history, rugged landscapes, and wide-open spaces, this route offers an unforgettable experience in the remote uplands of South Wales.

GET THE FULL ROUTE ON OS MAPS

Explore More Coffee Bag Adventures

This route guide is part of the Taylor’s of Harrogate Coffee Bag Adventures Collection and was created by OS Champion Carys Rees

EXPLORE THE

OS Shop

We are with you every step of the way. Shop our trusted walking and hiking maps and guidebooks so you can explore the outdoors with confidence.

Go to the shop

Go to the shop

Like this adventure

Liked by 0 users