Since the damming of the Zuiderzee in 1932 (since then called IJsselmeer), salt marshes on sandy soil along the Frisian IJsselmeer coast have developed into valuable freshwater marshes with a rich flora and fauna. Most of these are now nature reserves. The various vegetation types are briefly described, and a few very rare species, such as Carex divisa and an annual form of Pedicularis palustris are mentioned. The environmental management of the nature reserves is outlined, and a planning for the near future is given.