Large amounts of fine sediment accumulate in some lakes, disturbing the ecosystem. By reusing this fine sediment and Building with Nature techniques, a new island group is growing in the Markermeer, a large freshwater lake in the center of The Netherlands. We will show how a nature and recreation area has been created where plants, animals, birds and fish feel at home and where people can enjoy nature. Marker Wadden is an unique project: never has excess fine sediment been used on a large scale to construct natural islands and restore the ecosystem and improve water quality. The unique character of Marker Wadden has offered us an excellent opportunity to develop knowledge. We are eager to share this knowledge with you.