The Wallnau Waterbird Reserve (German: Wasservogelreservat Wallnau) is one of the most important reserves for migratory birds in Germany and the largest of NABU's nature conservation centres. The former pond estate of Wallnau lies on the west coast of the Baltic island of Fehmarn and covers, in its core zone, an area of just under 300 hectares (740 acres), of ponds, reed beds and meadows as well as part of the Baltic Sea and its fringing beaches. The nature conservation centre houses an exhibition on bird migration, a small restaurant and seminar rooms. Paid and volunteer workers look after conservation-related work and public relations. The centre is certified as the provider of education for sustainable development.