Porthclais is the small sheltered inlet port near St David's, a small city in Pembrokeshire, West Wales. Porthclais (also known as Porth Clais) harbour was built in the 12th century and served nearby St. Davids, importing coal and timber. The entire harbour is within the St. David’s Peninsula Site of Special Scientific Interest. Porthclais is still used as a small port by local fishermen and recreational sailors. The old harbour wall, built by the Romans is largely intact. The harbour dries out at low tide and is a good launching spot for small boats, dive craft and kayaks who are setting out to explore St Bride's Bay. There is a car park on the site of what used to be the now defunct St. Davids gasworks, which in turn was built on the site of a spring where it is said St. David himself was baptised.