The iconic sand island of Banc d'Arguin, located in the Arcachon Basin in southwestern France, is vanishing at an alarming rate. Once a popular destination for both tourists and locals, the island is now rapidly eroding due to rising sea levels, severe winter storms, and climate change. This decline is putting thousands of seabirds at risk, as they rely on the island for nesting and resting during migration. Ornithologist Paul Capbern reported a sharp drop in the number of young gulls, with only 89 counted this year—just one-sixth of the number from the previous year. Most of the 800 nests recorded in April were destroyed by storms and high tides, highlighting the growing threat to the island’s wildlife. Banc d'Arguin has long been a vital sanctuary for seabirds, including gulls, kittiwakes, and oyster catchers. The island, which was once 7 kilometers long, is now only 2.5 kilometers, and experts fear it may disappear entirely within the next year. Benoît Dumeau, the reserve's curator, explains that the island’s unique environment—free from predators and human interference—makes it an irreplaceable habitat for these species. However, climate change is increasing the frequency and intensity of storms, accelerating erosion and threatening the survival of the birds that depend on the island. Efforts to protect the island began in the 1960s when a tern colony started nesting there, but the area became vulnerable to human activity. In 1972, a nature reserve was established to limit public access and preserve the ecosystem. Despite these measures, erosion and climate change continue to pose major challenges. This year, a prolonged heatwave added to the difficulties, with young gulls struggling to find shade. Marion Celik, a reserve technician, emphasizes the importance of monitoring bird populations to guide conservation efforts. The interrupted kittiwake, a rare species with only 1,200 breeding pairs in the country, has not nested at all this year, raising concerns about its future. To address these challenges, the Marine Nature Park has created new protected nesting areas along the coast. However, human activity remains a persistent issue, with up to 1,200 boats anchoring near the island each year. The Sepanso Aquitaine, the organization managing the reserve, works to enforce rules that prohibit disturbances from dogs, drones, and unauthorized mooring. The rise of online boat rental platforms has made it harder to monitor and control access, leading to more frequent violations. While most interactions with visitors are peaceful, some have turned confrontational, with guards facing resistance from unaware visitors. To address these issues, the reserve is focusing on education and community engagement to raise awareness about the importance of protecting this unique and fragile environment.