Helvoetsluys, or HELLEVOETSLUIS

Helvoetsluys, or HELLEVOETSLUIS, a fortified seaport of South Holland, on the Haring-Vliet, an arm of the Maas, 17 miles SW. of Rotterdam. It has an excellent harbour, and is to Rotterdam and the mouth of the Maas what the Helder is to Amsterdam and the Zuider Zee. There is a school of navigation. Here William III. embarked for England, November 11, 1688. Pop. 4362.