The progressive loss of marshes, bogs and others wetlands through drainage and “improvement” led the Executive Board and the Ecology Commission of the International Union for Conservation of Nature to undertake a special project—project MAR—on the conservation and management of temperate wetlands. As with their African Special Project, the work is divided into three stages. First came the collection of data on the status and importance of wetlands and the methods by which they might most profitably be conserved: also the compiling of an inventory of important wetland areas in Europe and north-west Africa.