Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pen y Garn is one of the highest mountains in Mid Wales standing at 610 metres above sea level. It is one of the Cambrian Mountains. It tops a 500 600 m high plateau situated on which is the controversial Cefn Coch wind farm. The summit has a very large shelter cairn hollowed out from the remains of an ancient burial cairn. The summit also has a trig point. The wind turbines are very near the summit. To the north the whole Plynlimon range is observed, including the summits of Y Garn, Pen Pumlumon Fawr, Pen Pumlumon Llygad-bychan and Pen Pumlumon Arwystli. To the west is Aberystwyth, to the south Drygarn Fawr.