Perhaps the most remarkable example of reclamation of land from the sea bottom is found in:

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The Netherlands is famously known for its impressive system of dikes and polders, which has allowed it to reclaim land from the sea and expand its territory. The Dutch have been reclaiming land from the sea for centuries and have turned marshy swamps and shallow lakes into fertile farmland, creating new land for development and agriculture. This technique has been so successful that they have become world leaders in land reclamation from the sea.

Perhaps the Most Remarkable Example of Reclamation of Land from the Sea