. "SO215300"@en . . . . . . "1576"^^ . . "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."@en . . . . . . . "Pen Twyn Glas"@en . "Pen Twyn Glas, Mynydd Llysiau and Waun Fach from Pen Allt-mawr"@en . "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."@en . . . . "Pen Twyn Glas"@en . "OS Landranger 161"@en . . . . . "51.96292 -3.14392" . . . . "Twynglas.JPG"@en . "646"^^ . . . . . . . . . "1082174160"^^ . . "-3.143919944763184"^^ . "21208973"^^ . . . . . . . "sub Hewitt, Nuttall"@en . . . "51.96292114257812"^^ . . . . . . . . . . "POINT(-3.1439199447632 51.962921142578)"^^ . "21"^^ . . . .