Draethen is a village in the county borough of Caerphilly, South Wales, and the community of Rudry. The village is located some 3 miles east of Caerphilly, and 6 miles northeast of Cardiff. Located on the southern reaches of the Rhymney River within the historic boundaries of Glamorgan, Draethen is bordered by Bedwas to the west, Rhiwderin …Draethen is a village in the county borough of Caerphilly, South Wales, and the community of Rudry. The village is located some 3 miles east of Caerphilly, and 6 miles northeast of Cardiff. Located on the southern reaches of the Rhymney River within the historic boundaries of Glamorgan, Draethen is bordered by Bedwas to the west, Rhiwderin to the east, Michaelston-y-Fedw to the south east and Lower Machen to the north.