Mynydd Maen [Mynydd Twyn-glas]

Perched above the industrial heart of the South Wales Valleys, Mynydd Twyn-glas is less a jagged peak and more an extensive, rain-soaked plateau. It offers grand views of Cwmbran and Newbridge, provided you can navigate the dense conifer plantations without losing your dignity.

• •The mountain's name translates roughly as 'Mountain of the Green Tump'. It serves as a diplomatic geographic boundary, straddling the border between the county boroughs of Caerphilly and Torfaen.
• •While the summit is Twyn-glas, the southern shoulder is known as Mynydd Maen. Historically, these uplands remained open grazing land even as the valleys below were transformed by the coal and iron industries.
• •The northern slopes drop steeply into the valley of Cwm y Glyn. This area is heavily afforested, creating a dark, needle-filled maze that has confused many a confident navigator using an outdated map.
• •At 473 metres, it is often dismissed by peak-bagging snobs as a mere hill. However, the relentless ascent from the valley floor is guaranteed to make your calves reconsider their life choices.
• •The 'rolling plateau' topography is local guidebook shorthand for 'unfathomably boggy'. Be prepared to perform an unintentional interpretive dance as you attempt to leap between vaguely solid tufts of grass.