The Site covers the confluences of the Loire, Thouet, Vienne, Indre, and Cher rivers. Characterized by diverse wetland environments including riverbeds, sandy beaches, floodplain meadows and mudflats, it supports the survival and development of many threatened species such as the internationally vulnerable starfruit (Damasonium alisma) and the aspic viper (Vipera aspis). The critically endangered allis shad (Alosa alosa) passes through the Site during its migration. The wetland regularly supports around 49,000 waterbirds, including black stork (Ciconia nigra) and around 10% of the osprey (Pandion haliaetus) in mainland France. It is also home to a significant proportion of the global population of the light orange underwing moth (Archiearis notha), which reproduces here. The Site delivers a variety of ecosystem services, including nutrient cycling and the provision of genetic materials for medicinal products.