Dinas Island (Welsh: Ynys Dinas) is a peninsula, partially detached from the mainland, in the community of Dinas Cross between Fishguard and Newport, Pembrokeshire, in southwest Wales. A triangulation point shows 466 feet (142 m) above sea level at Pen-y-fan. Although Dinas Head is the northernmost part of the promontory where the cliffs meet the sea, the name is sometimes loosely used to refer to this highest point. Dinas Island is contained within the Pembrokeshire Coast National Park and the headland is under the care of the National Trust.