In 1421, a cat and baby in a cradle in this modern day country legendarily survived a natural disaster on the feast day of St. Elizabeth. A structure built in 1532 in this modern day country called Achtermeer is still operational today. A 1953 disaster prompted this country to begin construction of the Delta Works finished in 1997. During the 12th century, independent environmental management authorities called (*) “water boards”emerged in this modern day country. In the 20th century, this country filled in large areas of the “Southern Sea”through the construction (10[1])of polders by draining water. For 10 points, name this European country that has historically used dykes and windmill-power pumps to protect itself from floods of the Rhine River and North Sea. ■END■