Scheduled Monuments in Pembrokeshire Scheduled Monuments in Pembrokeshire Pembrokeshire is the fifth-largest county in Wales, but has more Ancient Monuments (526) than any except Powys. This gives it an extremely high density of monuments, with 33.4 per 100km2. (Only the tiny County Boroughs 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 was a historic county in its own right but between 1975 and 1996 it joined Carmarthen and Ceredigion in the much larger county of Dyfed.
Pembrokeshire Pembrokeshire from the border with Carmarthenshire westwards to Haverfordwest, then northwards to Fishguard. Some improvements have been made since the 1990s but others were still the subject of discussion in 2014. The A477 from St. Clears to Pembroke Dock is long, of which only are dual carriageway. The Cleddau Bridge carries the A477, connecting South Pembrokeshire with North Pembrokeshire, across the Cleddau Estuary. The A478 traverses eastern Pembrokeshire from Tenby in the south to Cardigan, Ceredigion in the north, a distance of . The A487 is the other major route, running northwest from Haverfordwest to St David's, then northeast following