Stelling van Amsterdam
The Stelling van Amsterdam (pronounced [ˈstɛlɪŋ vɑn ˌɑmstərˈdɑm]; "Defence Line of Amsterdam") is a 135-kilometre (84 mi) fortification line around Amsterdam, which would function as a national redoubt. It comprises 45 forts, as well as dams, dikes, locks, pumping stations, batteries and casemates.