page_title: Pen Twyn Glas
hierarchical_section_title: Pen Twyn Glas
caption_attribution_description: PEN TWYN GLAS
context_page_description: Pen Twyn Glas is a top of Pen Allt-mawr in the Black Mountains in south-eastern Wales. It lies in between Pen Allt-mawr and Mynydd Llysiau.
  The summit is merely a grassy bump on the ridge marked by a pile of stones.
context_section_description: Pen Twyn Glas is a top of Pen Allt-mawr in the Black Mountains in south-eastern Wales. It lies in between Pen Allt-mawr and Mynydd Llysiau.
  The summit is merely a grassy bump on the ridge marked by a pile of stones.
caption: Pen Twyn Glas, Mynydd Llysiau and Waun Fach from Pen Allt-mawr
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