Stormpolder Stormpolder Stormpolder 1818 Stormpolder MULTIPOLYGON(((4.581516 51.900564,4.573464 51.903924,4.558898 51.9058,4.569901 51.908034,4.576293 51.908169,4.581516 51.900564))) 1817-04-01 1855-09-01