Cefn-Coed, Merthyr Tydfil Located in Wales, U.K. Campsites: An index of camp and caravan sites in Cefn-Coed, Merthyr Tydfil. Includes addresses and contact information. Location: Cefn-Coed is located in Merthyr Tydfil, Wales. The location of England and Wales is identified on this world map. Includes links to counties throughout England and Wales. Merthyr Tydfil Attractions: Looking for Merthyr Tydfil castles? Castles in Merthyr Tydfil. Merthyr Tydfil News: Labour suffers in its heartlands Labour loses control of Merthyr Tydfil, Blaenau Gwent, Torfaen, Caerphilly and Newport in south east Wales. Merthyr Tydfil Towns and Villages: Cefn-coed Placenames Around the World