We came across an arch, probably the mouth of a collapsed sea cave eroded into the rocky coast by the incessant battering of waves on the wild Atlantic coast of west Ireland!

At the base of the headland, Achill Head, looking north towards Keem Strand where we went swimming a few days ago.

We hiked further up on the slope on our way back, coming across ancient rock walls. Were they property boundaries, maybe erosion barriers? They don’t seem to hold the sheep in or out of the area at any rate.