The Site is the largest coastal lagoon in Corsica, divided into two basins connected with the sea. It comprises shrub-dominated wetlands crossed by creeks within seasonally flooded agricultural land featuring excavations and drainage channels. It is of international importance for the maintenance of biological diversity within the Mediterranean biogeographic region: it supports breeding and wintering waterbirds including ducks, geese and swans as well as vulnerable reptile species such as Hermann's tortoise (Testudo hermanni) and mammals such as the long-fingered bat (Myotis capaccinii). The coastal lagoon is an important habitat for critically endangered fish species such as the European eel (Anguilla anguilla), and also supports diverse and rare vegetation which varies from halophytic species to submerged vegetation. The Site plays a role in flood regulation and groundwater recharge. The main threats to its ecological character are climate change and the introduction of invasive non-native species. Human activities include tourism, fishing, and scientific and educational activities. A management plan was approved for the period up to 2022 and was being renewed as of 2025.