The
Cantref of Penfro was one of the seven
cantrefi of the
Kingdom of Dyfed. It subsequently became part of
Deheubarth in around 950. It consisted of the long peninsular part of Dyfed south of the
Eastern Cleddau and the Daugleddau estuary, and bordered on its landward side by
Cantref Gwarthaf. The name derives from
Pen ("end", literally "head") and "fro" ("populated area"), and it means essentially "Land's end". Its area was about 361 km
2.