Plage Naturiste de l'Amer Sud lies on the open shoreline south of Cayeux-sur-Mer in Somme, Hauts-de-France. Access is on foot along the shore, with reported naturist use limited to the southern section. The surface is mainly pebbles, uneven underfoot, with sand more apparent near the water at lower tide levels. There is no dedicated beach car park; visitors generally use available roadside areas near the southern access and then walk to the shore. Public transport near this part of the coast is very limited, so most visits involve a car followed by walking. The beach itself has no admission charge. There are no toilets, showers, lifeguards, shade structures, or food and drink outlets on the naturist stretch. Carry water, food, sun protection, wind shelter, and suitable footwear for pebbles. Shops and facilities are in Cayeux-sur-Mer. Swimming is unsupervised in Channel water with variable waves and currents that can change with wind and tide. Check conditions before entering and stay within personal limits, avoiding longer swims when water looks rough or movement feels strong. The shoreline has no gates, so practical use is daytime and weather dependent. Typical stays last a few hours for swimming, walking, and sunbathing. From June to September conditions are generally more settled, while outside summer the coast is cooler, windy, and changeable. Midday and early afternoon are warmer, while mornings and evenings are quieter. Dogs may face seasonal restrictions, so control and leash use are advised. The quiet, low-density setting suits self-sufficient adults and experienced naturists rather than visitors seeking services, shelter, or supervised swimming.