Dinas Island (Welsh: Ynys Dinas) is a peninsula located in the community of Dinas Cross between Fishguard and Newport, Pembrokeshire, in southwest Wales. It reaches a height of 466' (142m) above sea level at Pen-y-fan, marked by a triangulation point. Dinas Head is strictly the northernmost part of the promontory, where the cliffs meet the sea, but 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.