The island of Mayotte, which has very varied coastal relief, offers fewer sandy beaches than its neighbors Grande Comore, Mohéli, the Seychelles, Mauritius and Madagascar, but has a great diversity of coastlines and sand colors (black, brown, gray, red, beige, white ...). Its lagoon is the largest (1,500 km2) and deepest in this part of the world (and one of the largest on the planet), and its double barrier reef is a biological curiosity that has only a dozen occurrences on our planet, hosting a great diversity of animals, including large cetaceans, which is extremely rare.