The Site is the largest freshwater reserve of New Caledonia, situated in the Great Lakes Region (Région des Grands Lacs) in South Province of Grande Terre, the main island. It consists of tree-dominated wetlands, shrub-dominated marshes, and permanent and seasonal rivers, streams, creeks, and lakes including a reservoir. It is internationally important for the conservation of outstanding endemic plants and animals; it supports vulnerable and endangered species which are important for the maintenance of biological diversity within the New Caledonian Moist Forests biogeographic region. The Site, which includes an extensive underground karst system, plays an important role in flood regulation, water supply, maintenance of water quality and groundwater recharge. The artificial Yaté Lake at the centre of the Site provides 20% of the country’s energy needs. The area is also used for research and tourism including camping, hiking and kayaking. The main threats to its ecological character derive from fires, forestry, invasive species, and mining in surrounding areas.