amsterdam
archipelago
artificial islands
biodiversity
bird spotting
birdlife
birds reign
blue
clay
constructing islands
cultural heritage
dikes
dunes
dutch
dutch zuiderzee
ecohaven
ecological
ecological restoration
ecological values
ecosystem
environment
fish
flooding
freshwater lake
haven for birds
holland
islands
lake
lake markermeer
land
landscape
manmade
marker wadden
markermeer
markerwadden
marshes
mud flats
nature areas
nature restoration
netherlands
sailing
sand dunes
scenic
shells
shore
siltedup lake
tides
unique
unprecedented
wetland sea