List of Roman-to-modern scheduled monuments in Pembrokeshire
Pembrokeshire is the fifth-largest county in Wales, but has more scheduled monuments (526) than any other local authority area except Powys. This gives it an extremely high density of monuments, with 33.4 per 100km2. (Only the urban authority areas of Newport and Merthyr Tydfil have a higher density). With three-quarters of its boundary being coastline, Pembrokeshire occupies the western end of the West Wales peninsular, terminating with the tiny cathedral city of St David's. It is a historic county in its own right but between 1975 and 1996 it joined with Carmarthenshire and Cardiganshire to form Dyfed.