Dinas Island 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.