The Green Bridge of Wales, in Pembrokeshire, was formed through the natural erosion of limestone, of which the arch is made. It’s the largest natural arch in Wales and one of the biggest in the world, to boot. Due to coastal erosion and waves, eventually it will collapse.
Visitors can reach this feature by means of the Pembrokeshire coastal path, near Bosherston, an easy grass path which leads to a viewing platform. The 186 mile (299km) coastal Path meanders on through some of the most ruggedly picturesque scenery in the world, with outstanding views of charming in-lets leading peaceful golden beaches, mysterious smugglers caves and other natural formations shaped by time and tide.