Machen is a large village 3 miles east of Caerphilly, south Wales, situated in the Caerphilly borough within the historic boundaries of Monmouthshire. It neighbours Bedwas and Trethomas, and forms a council ward in conjunction with those communities. It lies on the Rhymney River. Mynydd Machen (Machen Mountain) provides a view over the village. It is possible to walk up to and along the top of the mountain, where a number of large boulders are present.