The geographical feature known for its polders is the Netherlands. Polders are tracts of land reclaimed from wetland or sea, protected by dikes, allowing agriculture and habitation in otherwise marshy areas. The Dutch have become experts in water management and land reclamation, with about one-third of the Netherlands being below sea level. This unique landscape is a result of centuries of engineering to control water levels and prevent flooding. Polders play a crucial role in Dutch agriculture and urban development.