Why don't we do more of this? You'd think just creating land out of the sea would be high on the agenda for many nations. I suppose it does depend a lot on geography, the netherlands had the perfect shape to block off the sea. It would be cool to see new land created more though.
Also if anyone is in the know, how did they 'dry out' flevoland so to speak, surely it must've basically been a swamp with a high water table.