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Flood control in the Netherlands is an important issue as about two thirds of the country is vulnerable to flooding while at the same time the country is among the most densely populated on earth. Natural sand dunes and man made dikes, dams and floodgates provide the defense against storm surges from sea. River dikes prevent flooding from water flowing into the country by the major rivers Rhine and Meuse, while a complicated system of drainage ditches, canals and pumping stations (historically: windmills) keep the low lying parts dry for habitation and agriculture. Water control boards are the independent local government bodies responsible for maintaining this system. In modern times flood disasters coupled with technological development have led to large construction works to reduce the influence of the sea and prevent future floods.