Marker Wadden is an artificial archipelago of five islands constructed between 2016 and 2021 in the Markermeer, a large freshwater lake in the central Netherlands.

The project, run by Natuurmonumenten, is one of the largest nature restoration efforts in western Europe, built from sediments accumulated in the lake to create new wetland habitat for birds, fish, and aquatic life.

Only the Haveneiland is open to the public; the remaining islands are kept free of visitors to minimize disturbance to wildlife. Access is by ferry from the Bataviahaven in Lelystad, roughly nine kilometers away, or by private vessel.

Walking and birdwatching are the main activities on the island. Spring and autumn are particularly rewarding for birdwatching during migration, while some trails may be temporarily closed in summer to protect breeding birds.

Cycling, kitesurfing, and windsurfing are not permitted.