Porth Neigwl (Hell's Mouth)

Hell's Mouth is a four-mile scimitar of exposed sand and shingle on the south side of the Llŷn, and it feels wonderfully wild, the kind of place where the wind, the surf and the crumbling boulder-clay cliffs are the whole show. From the free car park at Llanengan it is a two-minute walk down to the beach, and once you are on the sand you have enormous uninterrupted space to work with, framed by Mynydd Cilan at one end and the Rhiw headland at the other. It is a magnet for surfers because it catches every scrap of Atlantic swell, which is exactly why it photographs so well: lines of white water peeling the length of the bay under a big sky. There is no national park here and no nearby airspace restriction, so the flying itself is straightforward. The catch is the weather; this beach earns its name, and a stiff onshore wind can make a small drone a handful, so pick a calm or offshore-wind morning. Keep clear of surfers and dog-walkers, launch from the beach rather than the crumbling clifftop, and treat the eroding cliff edge with respect. Autumn swells with light crowds are the pick.