[community] Cefn (a Welsh word meaning `ridge`) is a local government community, the lowest tier of local government, and part of Wrexham County Borough in Wales. The community of Cefn includes the villages of Cefn Mawr, Cefn Bychan, Acrefair, Penybryn, Newbridge, Plas Madoc and Rhosymedre and is situated on the northern slopes of the Dee V...