With the second-largest exclusive economic zone in the world at over 11 million square kilometers of coastal waters, France hosts seventy-one species of marine mammals. This French-language volume, produced in partnership with the Observatory Pelagis, presents the most up-to-date information available on the distribution of the sixteen Carnivores, fifty-three Cetaceans, and two Sirenia that live in French waters, summarizing over 90,000 observation data points collected since 2000 at approximately thirty locations. The book is divided into two complementary parts: species monographies providing information on distribution, biology, population dynamics, threats, and existing management measures; and oceanic region monographies of nine ocean territories, noting the species therein. In addition, the book includes an overview of various tools of legal protection and species conservation.