A small stone chapel, about six metres by four, wedged into a cleft in the cliffs at St Govan's Head, a little over a mile south of Bosherston. Most of it dates from the thirteenth century, but tradition says Saint Govan, a sixth-century hermit, lived in a cave on the site and is buried under the altar. Inside, low stone benches run along the walls; an empty bell-cote sits at the west end. It is Grade I listed.
It is free to visit, down a flight of steps from the clifftop car park. The road crosses the Castlemartin military range and closes when there is firing, so check the firing times before you go.