Bwa Gwyn — the white arch — is a bright band of quartzite on the Rhoscolyn headland, standing out against the darker rock around it. It’s a short walk from Borthwen beach, with views across to Trearddur Bay and Holyhead Mountain along the way. Open coast, so watch your footing near the edge.

© Eirian Evans / Geograph · CC BY-SA 2.0